We visited the last week of September 2003 and Oct 29-Nov4 in 2005. I found it to be significantly more crowded during last year's visit. Still much better than visiting in the Summer, though. Magic Kingdom was where we found most of the crowds. We even decided to go to MK one evening when it was pouring rain, thinking we could walk right on to attractions, but it was still very busy.
EPCOT was not bad either of the 2 days we visited, and the Food and Wine fest made it the highlight of my trip. I sampled food from many different stops along the way - delicious!