Technically also Disneyland's Fantasyland, with a Christmas overlay at both It's A Small World and Storybookland Canal Boats, but also the promenade mall that spans those two attractions.
Disney California Adventure decorates Buena Vista Street, Paradise Pier, Hollywood Land, A Bugs Land, and now also Cars Land. Here's a pictorial wdwmagic thread on what Cars Land looks like decorated for Christmas this year.
http://forums.wdwmagic.com/threads/christmas-in-cars-land-a-pictorial.855667/
That thread now has a video tour of Cars Land given by Anaheim's director of decorations (or some such title). It's an interesting insight into how they create this stuff for the parks and hotels. It wouldn't be difficult for WDW to have a similar program for their parks, decorating beyond Main Street USA or an entrance complex. It would obviously take some cash and an expanded staff from what they have now, but it's not something impossible to do by any means.
It's interesting how WDW approaches decorating the parks, while the same parent Company takes very different approaches at their similar properties in Anaheim and Tokyo.
How is Paris, I wonder? I've never seen what their Christmas decorations look like, or don't look like.