During WW II, milk cost 18¢ a quart in the store; 23¢ delivered to your doorstep. Work backwards, timewise, for the shipping and handling, from the delivery back to processing to pickup to milking. Sure, cows don't care about clocks, but the dairy farmer had to have those cans out in time for pickup for the NEXT day's delivery.
Row-crop farmers and ranchers always worked by the sun, not the clock. The change from 50% on-farm workforce to 3% on-farm has made a big difference in who's affected.
DST hurt the drive-in theaters.
I remember liking it because it meant an additional hour of outdoors play.