We went at the same time of year in 2000, and swore we'd never go at any other time again. It was amazing, the parks were quiet and peaceful, and we never waited more than 20 minutes even for the most popular things. The only times we really noticed crowds were at the parades (and it was manageable) and at Illuminations (that was really busy, because the other parks were all closed, so Illuminations was the only thing you could do at a park).
The decorations are up and everything is beautiful, beautiful...we can't wait!
Enjoy it!
Kris