Since no one is answering...... It is not decorated like Disney, but they do put up a tree or 2. Past years they had Norman Rockwell theme with displays around the park. There were also characters like penquins and bears dressed in winter hats etc set up in the park and a shamu(? )Santa for the kids in Santa's house.
Just at Sea World today, while we had a wonderful time as always I was very disappointed that the park was barely decorated. If you are going there to see decorations, don't waste your time.
Yep, I'd go to MGM for the lights. They have literally millions of lights with "snow" machines, music, etc.. It's called the Osborne Family Lights. Check it out at http://www.wdwinfo.com/holidays/osbornelights.htm