DD5's favorite ride... at least until the last trip when she was tall enough for Test Track. Now it's her second-favorite ride...
My DH and joke about it because he always falls asleep on the ride, so it's good naptime for him. Our whole family loves it, and we go on it multiple times each trip.
Last time the ride stopped right before we reached the top (medical emergency at the loading point). We wound up evacuating and walking all the way down on the inside. Got a great picture of my daughter sitting next to some statues in the Renaissance... Not quite as magical inside when all of the emergency lights come on...
All in a all a nice, slow, relaxing ride, perfect in the middle of the hot day. Just avoid it when you first come in the park. I think a lot of people ride it first since it's the first thing they see, and there's always a line in the morning. We ride in the afternoon and have NEVER stood in line behind more than a few people (since it's a continually loading ride the line moves fast).