I agree about the Wilderness Lodge. We stayed there the first week of December and it was beautiful. Each morning we would go down to the lobby to see that more decorations had been put out overnight.
WDW is absolutely beautiful at Christmas. Every place you go, whether a park or resort, the decorations are different but beautiful, never overdone IMHO. It's amazing to see how much decorating goes on. Do check out the Grand Floridian if you have time. When we visited, there was a beautiful gingerbread house.
You're gonna love it! Have a great time!