Slight dissent here. We were there from Nov 25th - Dec 2nd. Normally we go the first week of December but the oldest had final exam conflicts this year. For ten years. We've also been to both DW and DL in July so I can contrast.
OK. Personally, I thought it was somewhat crowded. I will admit that, except for Peter Pan, Pooh, and Pirates, every other ride in all four parks were basically walk-ons/< 5 minute waits for us, including EE and Soarin'. But we also had a plan and experience to know when to go and what to do. Maybe we were just lucky? On every ride.
I guess I just felt the parks in general were crowded. Compared to even a couple years ago, I'd estimated an increase of 25+% (I'd kill for 2002-03 crowd levels). Main Street was just busy and cramped every time we showed up. AK wasn't much better. Epcot and MGM were OK but by later in the day, yeah, they filled up too. And even though we never had an ADR seating problem for our given time, I can assure it we saw others who had big time problems (why do they have to take it out on the hostess?).
Maybe it's just me. Except for my wife, none of us are enochiophobes so I really can't attribute it to that. Maybe I'm one of those who can't let go of the past and can remember better, less-crowded times. So take what I say with a grain of salt. But, if as was pointed out to us that the Poly has been pretty much booked solid since August (and other hotels too), there is some truth here.