I am one of those people. The oral surgeon offered me the option of being put under for an extra $600 for the 45-minute operation. There are probably things I'd pay $800/hr for, but that wasn't one of them. He seemed kinda irritated; that meant he had to give me something like 16 shots to properly numb everything.
Personally, I didn't mind it. It was an interesting experience. I knew I was made of meat, but the smell of bits of it cooking really brought it home. And as you say, the sound was kinda freaky. But it was a good opportunity to practice keeping the mind centered and following the breath. Plus now I can joke that I learned to transcend dental medication.