Are you going to Mickey's Very Merry Christmas Party? That's a lot of fun... especially for the age kids you mentioned. Try to plan one character meal. (Even though your kids are a bit older, they'll still enjoy it.) Chef Mickey's is fun and festive during the holidays. (Everyone dresses up in Christmas attire.) It's fun to resort hop a bit around the holidays, too. Even my 5-year-old enjoys the various decorations. (WL, BW, and GF are particularly cool.) If you'll be there after the crowds start building and you're staying on-site, make sure to hit early entry mornings. You'll get to do much more. Hope that helps some.
Julie