I shot an M82 about a year ago, and it was a very fun rifle to shoot. The recoil was not bad at all, a little more than my .308 Win. Muzzle blast was much larger than a Mosin Nagant.
The only other .50 BMG that I have shot a friend's and I do not remember the make or model. It was a bolt action gun, and it did recoil more than the Barrett. However, recoil still was not that bad.
The worst place to be when a .50 is being shot is not being on the trigger, it is being next to the guy who is on the trigger. The muzzle brakes push the gasses (muzzle blast) backwards and to the left and right of the shooter.