I've seen it twice in the states.
First time was late last season, last chair. A chick a few spots in front of us was trying to load the chair, board in hand. No one really noticed until the lifty ran out as the chair spun around. Then shuttled her aside, explaining that she needed to be strapped in. She looked very confused. If this is common outside NA, perhaps she was foreign?
Second time was just Friday. Yet another chick in line, board in hand. She was with some other strapped in riders. I was slipping through the singles line so I didn't see if she tried to load that way, or if she was just chatting with friends in line. Either way. Odd.