Not an MG-42. But I carried the C9 Minimi (M249) and have observed a GPMG heavy support crew in operation. I bet you haven't even done that. I am telling you how I was trained to use the MG in the New Zealand Army. Once again, its the man not the machine.
Get back to me when you have participated in an assault on an enemy position as the gunner in a real infantry unit. I have done it many times using MILES gear and I'm telling you what you THINK it's like is not what its really like. The gunner feels like he failed if the enemy isn't dead when the assault troops get there. Scared just doesn't cut it.
Yes there are some training differences, like the one hand running thing... but don't try to tell me no German EVER used two hands, and no Russian EVER used one. Common sense says otherwise.