My friend Emily and her family are in Disneyland right now. I am so jealous! I went with them at the same time of year a few years ago and it was amazing! Those Disney people sure know how to make the holidays fun (of course they make everything fun in my opinion). There is an enormous Christmas tree at the front end of main street; wreaths and ornaments decorate every building; the characters are in their holiday sweaters; and you can even find Santa making appearances in California Adventure.
The best part of going to Disneyland during the holidays is the two rides they change for the season. It's a Small World is decorated to show holiday traditions in different parts of the world, and it is beautiful. But the best ride in the park from Halloween to Christmas is The Haunted Mansion. They change it from ghosts to the characters from The Nightmare Before Christmas. The colors are bright and crazy, and the voice talks to you in the style of 'Twas the Night Before Christmas. You see something new every time you ride, even if you go on it seven or eight times!
It's all just so much fun, and I wish I could be there right now!