My husband drove an Indy car there 2 summers ago. He had a great experience, it was a rainy day so there were not too many people signed up. We were worried it would be canceled, and it ended up clearing up. He was the only one out there. He loved it.
One comment - take a cab to the track, Disney transportation took him nearly 2 hours to get there, they drove him back to the resort in a van....