I have to say that we checked into the Dolphin on Wednesday night, the 24th, and were at the Boardwalk by 9:00. It was deserted!!!!!
Thursday we went over to MGM at about 10:30, and had no more than a 10 minute wait on ANYTHING including ToT, and RnRCoaster! Several times we commented on the lack of people.
In 3 hours time we did, RnR, ToT, Great Movie Ride, Muppets, Star Tours, Indy, shopping.
The Dolphin seemed empty, as well. We would look out our window every morning and see practically no one at the boat launches or walking the Boardwalk.
On Saturday, Epcot was crowded, but in general, I have never seen WDW as empty as it was this trip.