I had family who were farmers and I still have friends who are farming. I had to laugh when I asked my uncle about DST. He said it didn't matter. The cows needed attention the same time every day of the year. He never reset his watch. He always knew when to be to an appointment regardless. I was always impressed by how in tune with nature's rhythms he was.
He was a dairy farmer, but I can't imagine it would be much different for a farmer who does other types of livestock or only does cash crops. If it does, then that farmer has a different approach to farming than what I'm familiar with. I know more and more farmers are getting into different areas which connect them more closely with the rhythms of the city (so to speak), but I guess you need to consider that before you get into it.
There is a benefit to DST (IMHO) for people living around the 40 to 50 latitudes. (That might be an even broader range than I estimated.) It's a matter of visibility of school children. I know from personal experience since I'm out driving around during that time in the morning. I drive past spots where kids are gathering to get picked up by a school bus. Almost all the kids are wearing dark clothing and it can be hard to see them sometimes. So the earlier the sun appears, the more visible they are. So maybe DST is more useful as a regional thing. Although that would create other problems I'm sure.
One thing I do know. Nobody complains in the fall when they get an extra hour of sleep. The only time I hear complaints is in the spring.