I think I can help!
We don't get to WDW frequently, so I may not be the best judge of what is "crowded", but I can give you an idea how long we had to wait in lines at the parks.
Saturday, 11/1 - Epcot
We arrived mid-morning (had to sleep in a little after being out late at
MNSSHP!) and had to wait around a half hour to get into the park (bag check line and the turnstile line).
We used FP at TT and M:S and didn't wait in line more than five or ten minutes for anything.
World Showcase was crowded (IMO). We had hoped to sample several different foods, but the lines were almost all 15-30 minute waits. This was mid-afternoon. The lines weren't as bad closer to closing.
We lined up about an hour early to get a good spot for Illuminations and I think we had waited much longer, we wouldn't have had a very good spot.
Monday, 11/3 - MGM/Disney Studios
Crowds were pretty manageable. We used FP at TOT, RRC and Star Tours and didn't wait more than 10 minutes for anything. We rode RRC early in the day and I noticed that when we got off the ride the wait time was up to 25 minutes, but you could solve that with a FP.
We got to Fantasmic an hour early and had great seats.
Tuesday, 11/4 - Animal Kingdom
AK seemed crowded when we were walking around the park, but wait times were not bad at all. We rode Kilimanjaro Safari first thing and waited about 15 minutes. We rode Kali River Rapids twice w/o FP and waited abuot 15 minutes both times. Walked right into TTBAB. We lined up about 20 minutes early to get a decent seat for Festival of the Lion King. We used FP on Dinosaur and there were really no lines on Primeval Whirl or Triceratops Spin.
Wednesday, 11/5 - Magic Kingdom
We got to Fantasyland right away and rode most rides with five or ten minute wait. However, but the time we were finishing up Fantasyland, probably between 10:30 and 11:00, the wait times were creeping toward 30 minutes on many rides!
We walked onto Haunted Mansion before lunch. Used FP at Splash Mountain after lunch (the wait was 25 minutes w/o FP). Walked into HOP. No wait on Aladdin's Magic Carpet Ride. Five minute wait on POC. Mid afternoon it started raining pretty hard and the park cleared out, so we did Tomorrowland with pretty short lines. We used FP at Space Mountain and Buzz Lightyear Space Ranger Spin, but the line weren't REAL long even without FP.
Hope that helps!