So I've actually tried the VR out, and despite the fact that I thought it was going to be utterly terrible, I need to admit that I loved it.
The VR animation was tied to the layout of the track, and every movement in real life was replicated in VR. The VR world was not a circuit like real life, but rather a series of different stages giving you different feelings. Spoilers below:
One stage was flying through an old abandoned mine station with the rickety track below you falling apart and near misses on all sides. Another stage was jumping off the tracks onto another segment, and then finally landing on a dragon (Herman) who flies you into the town below for a nice safe landing.
The VR was so effective that there was a moment when I actually felt like I had done a corkscrew, despite there not being any inversions on Thunder Run. Truly, the VR breathed new life into this old coaster.
As for loading times? There were only about 4 people with headsets per train, and it added about 20 seconds to the loading time. Not terrible but it surely adds up. I think it's a great idea and I wouldn't knock it before you try it.