We were there last weekend (Oct. 14-17), although it was fairly busy I didn't find it "packed". We went to MK on the Friday of our trip. We waited about 45 min. to see Ariel and Cinderella in Toontown as they are together right now while they refurbish Ariel's grotto. And, this is the only place you can "meet & greet" with Ariel. Plus, at that time the skies opened up and people rushed into the tent so i'm sure that had a lot to do with it too. The other character lines were not nearly as long.
Most of the other attractions didn't look terribly busy. The other parks were fine, EPCOT was not real busy. AK and MGM were busy on the weekends. The B&B show filled up the bleacher stands in the back.
We did have PS's for almost all of our meals but the restaurants weren't real crowded.
It was a little busier than I expected (I'm sure many guests rescheduled trips from Sept. to this time too from all of the hurricanes). But, it wasn't uncomfortable, now the first week of June...busy and hot. I would never go back then, I would go back in Oct. again in a heartbeat.