I have a theory as to why more and more people say that the parks are getting more and more packed, this might get long:
I've been living in Orlando since 1997 and ever since 1998 have had an AP. The parks were packed back then, then came Fastpass which helped a lot and it didn't seem all that necesary to wait in line so it didn't seem that bad.
But then Sept. 11 2001 came and that's when the entire tourism industry in Orlando died down. There were many years that the parks seemed empty,be it because people were affraid to travel or whatever the reason, it was dead. that's when Disney started with the idea of the different themed years, most popular of all was Year of a Million Dreams to try and get people to come back, and they did, free dining followed and people loved that they could come and the parks had a reasonable amount of people but not super packed. Now the economy is starting to come back up, different incentives have been given to international travelers and so the parks seem busier, there's no real super-slow time of the year anymore.
I understand that it sucks when people come and it's so busy, and packed and whatnot, but it's a good sign that the economy is coming back and cities like Orlando are benefiting fromt his.