TD through Saturday is still very busy, but it becomes so nice starting on Sunday. This is our 4th trip at this time....done summer and Christmas as well and have never had it so nice. Waits will not be that long, but MK it can get busy later in the morning and through the afternoon. Most people there at this time have younger children and may be at Fantasyland more. We have a mix group, but take our kids out of school because it so worth it!
I don't know when you are arriving, but plan accordingly. BTW the Christams parade is filmed usually the first Saturday in December (should be Dec. 5th this year). Be prepared for chaos on Main Street. This is where they tape it. However, once you get past that the rest of the park is not that bad. Friday and Saturday will be busier again but not like Thanksgiving Day and the Friday after Thanksgiving.