[ghaff]

Time zones are valuable. They let me easily convert to local time which gives me a pretty good immediate intuitive feel (modulo differences in customs) for the types of activities appropriate to that time of day.

Mind you. I screw things up. Just did it with a meeting the other day. But with electronic calendaring it’s not too bad.

Added: when traveling, time zones let me change my watch once and I immediately more or less know time appropriate activities that more or less correspond to what I’m used to at home.