Every other blogger has something to say about the holiday, so I decided to, too, instead of feeling left out.
First off let me say this: I wasn't traumatized by Christmas growing up and I knew extremely early that Santa doesn't exist. I love Christmas movies, because I love the combination of magic and inevitably happy ending with a touch of moral-to-the-story. And yes, "It's a Wonderful Life" is a favorite.
So what does Christmas mean to me? Nothing. That's right, I said nothing. I'm not Christian, I'm not hung up on tradition and haven't made any of my own, and I don't have to have certain things or things a certain way at Christmas so as not to feel left out or lonely or un-Christmassy. (Except maybe my own blogpost about it.)
I enjoy the lights, the atmosphere, the constant greeting other people with "god jul"/"Merry Christmas", the reminders to be generous, the spirit of the season, but I don't decorate or go overboard with the food, though I'll dress up. Sometimes I'll play Christmas carols. I like buying presents for people, but I don't like crowds. That last is a year-round thing, though.
The most important thing about Christmas for me is what I just did: Spend lots of time with people I love.