First sentence, muse, I'm right with you.
After that and hearing other posters' experiences I experienced the same unpleasant feelings I have once I am shut in and really unable to move. And that's just reading. A friend and I went on a picnic one Sunday in the Mendips when I was still at school. We were accompanied by two young male friends who were going to do some pot-holing. My one and only experience wasn't too bad : we actually clambered with them down into the first cave (easily accessed from the middle of a large bush!). I sat on a rock while they went struggled and slid down a 'chimney' into a chamber below. After about 20 minutes I was concerned - no noise, no voices in response to our calls. I dropped a pebble - then we got some noise, quite a few strong words as the pebble bounced on the helmet of one of the guys as it gave him a fright. Not sure how long they struggled to get further below, but it made me feel a bit panicky and I was glad to see them again and to climb out of the bush onto a sunny hillside (to the amazement of some walkers).
When my children were small, I was persuaded to go into one of the Welsh gold mines. Can't recall which one. This is possibly because the experience was so awful. No climbing just a good, slippery walk to reach the main cave where a pompous and very stupid old 'guide' gave us all a lecture on the history of the mine and then, without warning and to 'give us the experience', turned off every light. I actually couldn't breathe and when the lights finally came back on, I only wanted to punch him in the face! I've been in other caves - Wookey Hole being one - but never had someone in charge of a huge party of people behave so stupidly.
Caves, narrow places, tight high steps in castles, places from which there is no retreat, are now definitely not for me. Alton Towers? Not sure what fortunes would have to change hands for me to participate. But some, often young, people thrive on the adrenaline rush! I honestly can't imagine paying to be scared witless. Each to his own, however!