You will always have people who complain about new and old things, it is just how people are. There is nothing wrong with holding a company to a high standard, especially when that company brags about its high standard. Us regulars should complain when we see that standard not being meant. So many companies fall into that trap where they start out with a high end product and than start to cheapen it to not just make a profit but to continually increase profits. They live off their original high end image and than over time the customer begins to realize that their product is decreasing in quality.
My point is that, yes people will complain even if something is awesome to others, it just doesn't mesh with them. This will always happen. Then there are people who complain no matter what, there is no satisfying them. There is also people who will always like everything a company like Disney does.
The last two groups do nothing to improve a product. When the majority agree that something is bad or that something is good, this is when a company like Disney needs to respond.
Also, it is not just regulars who complain about Disney, I have talked with more people that have been to WDW once or twice and have commented on crowds and wait times and how they will never go back. There are also people I know who have never been and do not plan on going for the same exact reason.
Crowds seem to be WDW single biggest problem and they need to start addressing it, this problem kills the experience. They seem to be trying to address it with after parties and ticket increases. One way that curbs crowds is the way most of us just don't want to see and that is an economic downturn.