OK.... Here are my thoughts about crowds from our trip (11/20-27. 2003).
This was our third trip in a row to go around Thanksgiving and this was clearly the largest crowds of the three. I'm convinced the economy and FTP had something to do with that.
Thursday and Friday before Thanksgiving were a breeze. No lines, no issues. Walked onto just about everything and took naps in the early afternoon. No wait for Mission Space at 5:00 PM on Friday. About 20 minute wait for TT, but we did the single rider line with no wait.
Saturday was busier, but manageable. We did NOT go to MK on Saturday. We went to MGM and AK. We were at AK for only about 3 1/2 hours in the afternoon and saw virtually everything except for Kali River Rapids.
Sunday we did not go to parks, BUT we did go by MK on the monorail and found the crowds to look very big. Not sure exactly how big, but it looked very busy.
Monday we went to IOA / Universal (Third year in a row, same day). Crowds were small in the morning at IOA and large in the afternoon at Universal. This was typical of what we had seen in previous years, but the crowds were bigger. Again, we saw everything we wanted to see, but it was definitely busier this year than in 2001 and 2002.
Tuesday saw BIG crowds at MK in the morning. Long lines by 10:00 on most every ride. No park Tuesday evening.
Wednesday morning we went to AK early and saw huge crowds, but were able to do a few things before lunch. (Mostly shows and the walking trails) Wednesday evening was very busy at Epcot with a 120 minute wait for Mission Space standby line and 50 minute wait for single riders. This wait lasted well into the evening.
We headed home on Thanksgiving day around noon, but the bus stop and food courts were HOPPING and busy before we left. Can't imagine what the parks were like.
Even though the crowds were bigger, I didn't find them unmanageable or unbearable. We started early, hit quite a few things, took a nap, went to another park in the evening where we soaked in the magic.
Hope this helps!
Maverick