One exception I know of is dairy farmers. Cows need milking on a regular schedule, usually about 5 am and 5 pm. They don't understand DST, so Amish for example stay on standard time.
Several people on here call others idiots for not liking dst. But these same people all say how they love having that extra hour of sunlight in the summer. Hey einsteins, just leave the country on summer time all year, geez... then no one has to reset clocks or their body.