FWIW, as a EU citizen the things I've heard about traveling to/from/in US have mostly made me go wtf. Perhaps it's just because I spend too much time reading about TSA etc. on reddit, but maybe not.
On the other hand, recently (should I say this anonymously), annoyed by the extra security and machines, when a TSA agent asked me to take off my shoes and my sweater, I said fine. I went topless. After all, that's what the new machines see anyway.
The look on the TSA agent's face? Ouch.
I have flown in JFK, LAX, LAS, and MKE since the body scanners started. There's usually at least one line that uses a metal detector still. So I always pick that line.
It is a joke, though, to see middle-class, middle-aged women in a long-sleeve shirt and jeans getting a body scan and then a subsequent pat-down. What a waste of my tax dollars.