My favorite is the opening at Epcot, the dove release is impressive(if they still do that). The Animal Kingdom is also very good. They bring out all of the Disney characters in safari-type costumes and put on a little show. It always best to be as close to the front as you can be. Enjoy!
The AK is still my favorite opening, but the opening for the WS is neat too. Being selected the Viking of the Day at Norway is just too much for many of the folks so chosen!