Probably preaching to the choir here but -
As has been said already, if you go looking to have a problem, you're likely to find one. My father is one of those types that can have a problem with the check in process on a 7 day vacation and then not enjoy anything else for the rest of the time.
It's all a matter of attitude. I have traveled a lot in my 38 years, but there is not a better, more thought out, and accessible vacation to be had then a week at WDW. But if you think that all you need to do is pay for the trip and every thing else will happen automatically, it's not hard to imagine this:
"Why I had a bad time at Disney World"
A fictitious story that we've all seen happen too many times.....
You book a room at a value resort during cheerleader/marching band week in July. You land in Fla and have a problem getting a rental car. You booked a compact, but what you needed was a full size (you're carrying your own luggage because you didn't read the fine print about the yellow tags and magic express). You try to follow the map that the rental guys gave you, but they didn't tell you you'd need cash for the toll lanes. You arrive at Disney, but have no idea where to go. You thought it would be hotel on the left, and theme park on the right. You get totally lost on the property, and finally after stopping at the same Hess station twice to ask directions, you find the POP. You stand in line in the lobby for 45 minutes waiting to be assigned a room. You get a smoking room downstairs, (of course you didn't bother to ask for an upstairs non smoking when you booked), and are mobbed by a loud bunch of kids coming back from the pool. You finally land in your room drop your suitcases and decided to try to get in dinner and a few rides before bed.
You drive your rental car to the TTC and get on the ferry over to MK just in time for the dinner rush. There are no seats anywhere for the food places, (it's EMH tonight at the MK and it's July 10th of course). You give up and grab a hot dog and some chips and look for a bench to sit on. Your kids are starting to whine because you left for the airport at 7:00 that morning and now it's 7:00 PM (10:00 to you, being from Washington state), and you start to get angry. The wait for everything is at least 45 minutes, and the only thing that doesn't have a line is the TTA. You manage to make it through the fireworks, but can't see much because you're in the mass of people who are standing directly in front of the castle. Now you're trying to get down Main Street to get back on the ferry to get to your rental car, to get back to the hotel, and you've got a crying 6 year old and a sleeping 3 year old. You finally make it back to your room at the POP, get into bed, and every 5 minutes you hear a toilet flush or a door slam. You think "I've only been here 5 hours, and I already feel like I need another vacation!"
The following four days are much like the first, you try to sleep in, then have breakfast at the food court (which is a mile from your room), and by the time you get to the parks at around 12:00 it's crowded, hot and all the Fast Passes are gone. You're not even sure what a Fast Pass is, but there sure are a lot of people that seem to be cutting in line, and the people who work at this damn place don't seem to care!! The loud kids from your hotel seem to be following you, or at least they are always waiting in the same line you are. You watch your wallet empty, your kids get more tired, and no one seems to be having any fun. You and your wife are constantly snapping at each other, your three year old wants to see Mickey Mouse, and your 6 year old wants to ride Space Mountain. You heard that there is a great place called Animal Kingdom, but you don't bother to go there because you came to see Small World and the Castle, and you don't want to go to some "zoo thingy". You manage to make it to Epcot, but the place is huge and your kids think it is boring. You haven't had a good meal because the only places you can get a seat at are the food court, and Cosmic Ray's. Everyone else seems to have reservations, but when you called from the hotel, they said the next available reservations were in October. You try to do some souvenir shopping on main street, but you always do it at closing time, and the lines to check out are as long as those for Splash Mountain (which has been closed for refurbishment your entire vacation). All around you you see people having fun, but you really don't feel like one of them.
You've finally learned about the Disney bus system and your rental car has been sitting unused ($34 a day). It seems to you however, that the POP bus always seems to have the longest line, and there is always at least 3 motorized scooters driven by very large people to load. You still can't figure out why they put the best rides on opposite sides of the park, and are stunned how short the Pooh ride was after waiting in line for 45 minutes. Last night when your 3 year old had a melt down after loosing her mouse ears on the train ride, your told your wife (and everyone else on Main Street) you were sorry you'd ever had kids at all!! You know that marriage counseling is surely in your future. You get into an argument with a rude man from somewhere "foreign" who thinks it's OK to put his kids on his shoulders right in front of you during the parade. Then, to top it all off, the guy at the rental car place insists that the big dent on the passenger door wasn't there when you took the car.
At the end of your trip, all you're left with is tired feet, a strained marriage, an empty wallet and $4,000 on your Master Card. No wonder you get back to the water cooler at work and trash WDW.
Imagine if you'd done a little reading, a little planning, and talked to some people about what to expect and how to approach your trip to WDW - you might have ended up a fan like the rest of us!!!!!