Just posted this in your other thread, but just in case
Went last year Sept. 28 - Oct. 3. Very hot and humid. Very low crowds. Most Fastpass machines weren't even open. Rode Buzz 3x without a line at all, like, no one in front of us. They let us stay on for another round of Tommorrowland Indy Speedway. Walked onto Small World, into Philharmagic, no wait for Snow White, 5 minute line for Mansion, 10 minute line for Splash, no wait for Pirates, 5 minute wait for Thunder. At Epcot, 10 minute wait for Soarin, walked on to Test track. At MGM, walked onto RnR and Star Tours, and Great Movie Ride. Sunday started getting really busy, but still walked onto Kilimanjaro in AK, FP'd Kali, 20 minute line for Tough to Be a Bug, 20 minute for Dinosaur. By Monday it was packed, tried MK, but couldn't get on anything, 90 minute wait for Peter pan and Small world, so gave up, it was our last day anyway. Evidently some schools start Fall Break that week, who knew? So, parks empty up till Oct. 2, after that, yuck. But mind you, only other trip was MLK weekend, so no real busy times to compare it to. BTW, we were there for the free dining, too.
Hope this helps!