Keep in mind, if you stay on property (Swan/Dolphin or any Disney owned resort) you can get into one park an hour earlier. This makes a HUGE difference if you're willing to wake up early. The extra hour shuffles between parks based on the day of the week.

I was in Orlando for a trade show in Octorber and by staying at the Swan I was able to use the early entrace to beat the crowds. Within 90 minutes I had ridden every ride and seen all but one attraction at Epcot. I then went to Animal Kingdom and saw everything. Same thing with MGM and the Magic Kingdom the next day. I basically rode every ride (some repeated times) in all 4 parks over a 2 day period.