We usually go the week AFTER Thanksgiving, because we love seeing Disney decorated for Christmas!!!! Nobody does Christmas quite like Disney!! This year, though, we had to go a little earlier, and were there Nov 15 -21 (the Thursday BEFORE Thanksgiving).
We stayed at Coronado Springs, and it was very nicely decorated!! There were a lot of decorations up at the hotels, and the parks had most of their Christmas decorations up. We were a little disappointed that the Grand Floridian tree was not up yet - but the gingerbread house was up. Also, the big tree at Animal Kingdom Lodge was not up the night we had dinner at Jiko. I didn't realize at the time we made the reservations that the Candlelight Processional at Epcot doesn't start til after Thanksgiving.
It was a great time to visit - low crowds, wonderful weather!!! It just wasn't completely finished with Christmas decorations! But it was still beautiful - and I'd go again that week!!!!
Have a great trip!!!