I don't decorate the bedrooms. I decorate the living room and the kitchen only. I decorate less than most women do. When my daughter was younger I would put a little tree in her room, which she loved. She (and her room) have outgrown that now.
The living room is decorated for Christmas and not the bedroom. Of course, the whole house is painted, new curtains replace the old ones and a Christmas wreath on the front door. In the bedroom, I am content with brand new sheets and curtains. For the bedroom to be decorated, I believe that it all depends on the individual's personality and taste. But for me, the bedroom is my oasis and there is no need for it to be decorated.
The very most I would get is like a little ornament and that is usually because there were too many left over after decorating downstairs.