We've been many times in October and IMHO, it was a little more crowded than usual, but not that much.
We stayed off-site at Cypress Pointe and they were not full. Disney resorts were not full bc they had the "Rooms Available" sign up on road near the auto care center. Parking lots were not nearly full, we parked pretty close every day.
Having said that, we made the "mistake" of doing MK on Saturday. I hate MK on Saturdays, but it was the only night they were doing Spectro (2x, at 8:00 and 10:00, I think....) and Fireworks so as we did not feel like hopping, we got to MK late-ish and found that was a good strategy. We used FastPasses and never waited long. Where you could tell the park was busy was in the restaurants and shops, and over at Toontown where the wait for characters was close to an hour.
Epcot was fine. FutureWorld was a little bit more crowded than usual, but not much. We always hit Epcot late, never get there before 11:30 so that most of the crowd is headed toward World Showcase by the time we are in FW. We had no wait for anything, really, as we did FastPass for the Land. We skipped Living Seas this time, and to DH's dismay, he did not get to do MS but at noon, the wait was listed at 30 minutes. WS was busy that day, but not unpleasantly so. There were no waits for the characters, but getting food took awhile.
AK was pretty busy too, but I always feel crowded there due to the narrow pathways. They were turning people away at every Lion King show...and BTW the new set-up with AC is FABULOUS!! We never got to Kali bc all the FastPasses for the day were given out by 2 pm, and when we returned at 3:30 hoping for a shorter line due to the parade, the wait was still an hour. None of the kids had any interest in anything in Dinoland, so we left after that, even before the parade started.
We did Typhoon Lagoon yesterday and it was not busy at all. We never waited more than 3-5 minutes for anything.
We missed MGM bc DD picked up a 24 hour stomach bug, so we were housebound for a day. And boy was I glad we were in a nice big condo or we would have gone stir-crazy!!
Hope this helps.