For dinner, they seat you. Once I asked to be seated in the "Rose" Room - it is dark and has thunder/lightening going off periodically and they were able to do it. But that room is small so I think it's tougher to get a seat in there.
The last 2 times, I was seated in the Ballroom which is beautiful.
We are doing 2 pre-park opening breakfasts and one dinner so hopefully we can do both!
We sat in the ballroom and chose to sit next to the windows which have the look of falling snow.
In April, we were seated where hammie59 sat (although, if it was a choice, it sounds like hammie59 may have visited at lunchtime; at dinner you are seated by the wait staff) ... in the ballroom right near a window. We loved it. The light is lower there than at the center of the room, which creates a nice ambiance, but isn't as dark as the West Wing. The snowfall effect is absolutely charming and does a great job capturing the feel of the movie.
The Rose Gallery has a large statue of Belle and Beast dancing in the center. The statue rotates (like a music box). It is very bright and cheery in there. I've eaten lunch in there once.
The West Wing has thunder and lightning and is dark. It seems to be a popular request and is a small room. I've never been able to sit in there.