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I used to do it. Stopped suddenly. I'd spent a Fri/Sat beating myself up because I was 4 lbs over race weight - really down on myself - and then ran a pb at the race on the Sunday (despite still being up 4lbs). I literally haven't weighed myself since (used to be every day).
It wasn't a healthy habit for me - or my friend. But I know other people who quite happily chart all their various metrics, and don't seem fussed by it. Runners do tend to be obsessed with numbers (at least that's my experience).
yes, I think road running especially really lends itself to metrics. I do wonder how different my experience would be if I took my watch off for a race - it's actually quite difficult to imagine
It makes me anxious even thinking about it! You'd need to be pretty confident about your pace judgement, otherwise things could get messy. Do you train without a watch? That's certainly recommended as an occasional thing (as I'm sure you know).
yes, I do sometimes - mainly because I'm quite crap at remembering to charge it. I'm also trying not to wear it except for running - I found I was obsessing over all the other things it was measuring (steps, sleep hours, etc etc), which previously I hadn't cared about.
FWIW - not a lot! - I think you're very sensible to take the thing off except for running. That sort of monitoring isn't going to end well.
I think my mother set fire to my father's blood pressure monitor after he began to bring it to bed so he could take his BP in the night! 
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