I started wearing a watch in grammar school (Swatch!) until some time just after law school. At that time the bands on most watches started giving me a rash on my wrist.
Last year, we were going to go on a three week trip overseas (where my mobile phone would not work and, thus, the time would not update) and I knew I would want to know the time, so I started wearing a watch again (different type of band that did not irritate my wrist).
Since then, I wear a watch every day.
(Also, I go into some buildings where mobile phones are not allowed, so having a watch is nice.)
MotionMan