Yeah, I feel the same way. I have occasionally been handed strangers' phones at work to solve some technical issue, and I would not at all be comfortable doing that if the situation were reversed.

I am also weirded out by people who unlock their phones via patterns and just draw them where everyone can see.

I am *also* weirded out that my parents are so casually ok with me knowing half their passwords but at least there I know why they trust me.