We were there from 5 - 9 Jan and the parks were very quiet, low crowd levels with the majority of rides walk on. Arriving on the Sunday which was busy gave us the opportunity to ride the attractions that would be closed for the rest of our stay there and soak in the Christmas atmosphere.
The Christmas tree and decorations in Main Street USA and the ones in the hotels were still up when we left, but we did notice them slowly disappearing around the resort.