I went on it and 2008 and don't remember hating or loving it. It was fine. Ellen, Bill Nye, and dinosaurs are cool.
But I haven't been on it since. I'm not vehemently opposed to doing it again, but it's never been a priority, even when I took a first-timer last year. I think what I'm trying to say is it's nice to see it at least once if you have time, but you may not feel like you have to go on it every trip after that.