I'm an overgrown child, so I absolutely have to have a tree. We were in WDW last year for Christmas (22-29th), and I went all out for the holidays like I always do. For me, Christmas starts the day after Thanksgiving, so that's 3 weeks I got to enjoy the tree before I left. Of course for safety reasons we left it turned off while we were gone, but we had a neighbor come over to feed our cats, so she watered the tree too.
I say do whatever is going to make the holidays enjoyable (and not stressful) for you. But if you end up getting a tree, maybe you could get a small one that won't be as much of a hassle.