my family and i usually go every year at thanksgiving. this is sooo nice because the lights are already up, it still has that christmas feel and you dont have to worry about telling your gram to sit down and eat already. the only thing is sometimes country bear jambouree isn't set up for christmas yet.. that varies. but thats def not a big deal at all.
we did do christmas in disney once though. however, we left on christmas morning for our flight home. it wasnt bad at all. it was nice to have christmas eve dinner in disney and wake up in disney on christmas morning with tiny stockings that had a park pass for each of us saying we were coming back in november.. pretty cool.. and when we got home, presents were already under the tree. (my dad ended up coming a day later than us.. hmmm wonder why

)
hope this helps a bit!