Here are a few of my tips...
* Osborne Lights in DHS
* Holiday Story Tellers in Epcot
* Candlelight Processional in Epcot
* Illuminations has a holiday tag at the end at this time of year
* Cinderella's Wish castle lighting ceremony each night in MK
* While you're seeing it in the park, you might also try to catch Holiday Wishes from outside the park as well from a point where the music is piped in...like the Poly Beach, Contemporary deck, and the GF dock.
* Decorations at Ft. Wilderness
* DTD has nice decorations... really pretty light tree and music over near Fultons and Portabello
* A good handful of the resorts have nice trees and/or neat gingerbread creations (WL,GF,AKL,BC,BW are the ones that come to mind first)
*Also, the new projection show on the castle has a holiday portion in the middle