I'm sorry to inform you of this, but the world has changed. Security has become a big thing thanks to some idiots who decided to use planes as weapons, college tuition is expensive but worth it for most jobs, however, not necessarily required to get a good job making a decent living (I'm doing it).
These things are unfortunate, yes, and make life more difficult to navigate at times, and even frustrating, but none of them are impossible and certainly not going to ruin a vacation.
If you've been going since WDW opened, then you no doubt understand that things have changed. The property has grown from one park with two hotels to 4 parks, plus two waterparks and more than 2 dozen hotels! Attendance has swelled to the point that even in the "off-season", crowds can be large at times. All this to say that going to WDW and having a nice leisurely day and being able to see and do everything is difficult, but not impossible. Disney, in their questionable wisdom, added the ability to reserve attraction and restaurant times in an effort to help guests enjoy the parks. The features they added to do this are FP and ADR, which is available to ALL guests in some form or another. Choosing to use these reservation features is completely optional to the guest. Not using them doesn't equate directly to having a bad time in the parks as you suggest, but it may make certain attractions and/or restaurants less accessible to those guests. However, because of the size of WDW, there are still MANY other attractions and restaurants that can be enjoyed and offer experiences for guests that while not necessarily the same, can elicit the same feelings of fun and pleasure.
For the record, I'm not a big planner myself, but my wife is. We find a happy balance somewhere in the middle. She makes the plans for us, but keeps them somewhat flexible and loose to allow for down time or "free roaming" if you will, where we go searching for something to do, or nothing at all. We have the luxury of having been to WDW many times ourselves and thus have our favorites and use FP and ADRs on for those. Outside of using our FPs, we tend to wander the parks, looking for short (tolerable) lines and go on what we feel like we want to wait for. If we don't get to ride something or eat somewhere specific, we find something else, and say, "maybe next time", but still we have fun and enjoy to the fullest what we get to experience, we don't sulk, whine and pout about those that we didn't.
In short, I take kind of a Baloo attitude:
So just try and... relax. Yeah. Cool it. Fall apart in my backyard. 'Cause let me tell you something, little britches: if you act like that bee at... Uh-uh. You're working too hard. And don't spend your time lookin' around for something you want that can't be found...
When you find out you can live without it / And go along not thinking about it / I'll tell you something true / The bare necessities of life will come to you.