I always wear one at work, and honestly feel lost without it, even though my phone's in my pocket most of the time. Maybe it's because I'm dealing with customers most of the day, but I find it rude to pull out my phone on the sales floor just to check the time, so it's nice to take a quick look at my wrist to know where I'm at for the day.
When I'm around home and that though, I never bother with watches. I've got my phone attached to my hip like everyone else.