Jeanne,
We started limit-feeding in 2007 - out of necessity. Disastrous Easter freeze followed by severe drought(1" of rain between May 10 and October 30) decimated pastures and locally-produced hay was virtually nonexistent. Some folks were paying $90/roll for cornstalks or CRP residue harvested in late October.
It was a case of 'limit feed, or sell out'.
It worked so well - and the cows came through the winter in so much better condition than they had in the past - that the farm manager(my wife, also a DVM{retired}) decided that we'd just continue doing it.
More time-consuming than labor intensive, really. She goes out at 5 am, lets the dry cows/weaned heifers in to hay, then goes back to bed. At 6:30 we put out the distiller's grain, the first group comes into the barnlot to eat DDG, and the Fall cows/calves come in to eat hay. When the first group finishes their grain ration, we drive them out and put out the DDG for the second group, then go to the house for breakfast. At 8 am she lets the second group in to eat grain, closes the gate to the hay lot, and lets them depart the barnlot at their leisure. She can then go on to her tennis game or whatever and close the barnlot gate when she comes home. Three hours, and not all that physically demanding.
When we started, we were primarily a spring-calving operation, with just a few fall-calving cows, but we've moved more and more to fall calving in the meantime. I will say that this year's fall cows have not all maintained the body condition that I'd like to see - 1st calf heifers, especially - even though the fall calves are 'creep grazing' stockpiled forage in the creekbottom field adjacent to the sacrifice lot(there's a high spot in the fence where it crosses a waterway - calves can/will go in/out, but the cows won't try it). About half the fall herd cycled back in timely manner and most appear to have stuck on 1 AI service, but some we just turned to the bull we've not seen in heat; Time will tell, however, whether they bred back or not.
Calves all grow up knowing what feed & feedbunk are - weaning and getting 'em started on feed is no problem; the next person down the production chain should have no issues there. Manageability of the herd as a whole is markedly increased. One person can pretty well cut out individual animals at the gate now without 'em getting crazy - 5 years ago, that would have been unimaginable.