Fenceline weaning, where calves and cows can see each other and rub noses through the fence or gate doesn't seem to be that big a deal with my Herefords. I usually wean at about 7 months in November as they come out of the chute from their fall booster shots and pour. Cows go to the left, calves to the right.
A day or two of bellowing, mostly cows with full udders, and everyone goes back to grazing or hay. After 6-8 weeks I have put retained heifers back in with the cows with no problem as long as I've moved the bulls to their winter pasture. Really no additional cost to wean. Calves are on good hay and some occasional sweet feed in the corral bunk to get them used to coming to me.