Well, yes, I'd say that doing the cavern tours without cave training was a little bit of a trust-me dive. I'd have felt significantly worse about it had I not done the wreck workshop, which introduced line handling, line following, and lights-out exits. I'm fairly certain that, had all our lights failed in the caverns, I could have found the line, or followed the ambient light out. I'm QUITE sure that, had anybody's equipment catastrophically failed, we could have managed an air-sharing exit without any difficulty at all, since we were in wide passage where you could always turn around, and always swim side-by-side.
At the risk of sounding rather elitist, I think there's a big difference between taking somebody who's passed Fundies on a cavern tour, and taking somebody straight from OW. We saw a number of those. I did hit something with my tank, but I suspect most beginning cave students do; it wasn't from lack of buoyancy control, but from inaccurately estimating the size of my underwater body. I did not kick up any silt, nor did I stray off the line.
Yeah, it's a "trust-me" dive to an extent, but at least I thought about the issues before we went.