I think Paris has the most constant Christmas tree of all the resorts. It hasn't changed since about 1993. To compare, think what they went through every year in Anaheim until last year. Cut down a tree, trim it, fill up the gaps, spray-paint it and decorate it with more ornaments than there are people in China. Heck, most people with artificial Christmas trees go through more trouble each year than the Disneyland Paris people, haha.
Then again, if they were to redecorate it now, they'd probably go for that icy blue crystal style that seems to be all the rage... Maybe it's for the better. Bring on the holidays!