OK I absolutely love the Osbourne Family Lights (which they are meant to be having this year)! They are fantastic. The one year we went they had a 3D light section where you could look through free 3D glasses and see flying angels! It is fab!
Also go and look around at least 1 disney hotel as the decorations are fab! Grand Floridian most years has a giant gingerbread house in its lobbey which kids love! Use the Disney transport from any park and go and be nosey.