You are all describing standard behavior at
DisneyLand Paris.....The Brits and Germans will line up, very orderly, and wait their turn, but there are other cultures that will not. I have had my toddlers shoved, pushed, moved aside, knocked down by adults and children alike.
I speak English and can get a bathroom, doctor and dinner in about 5 other languages, but I found that a glare, strong tone of voice and invading personal space gets my point across.
At one point, going onto It's a Small World (huge open loading area, going into the lines), a swarm of teenagers ran up from behind, pushed us aside to get into the turnstiles, and knocked my DD3 to the ground. I grabbed on girls arm, kicked her hard, and told her to learn some manners. I pointed to my daughter, on the ground crying, and squeezed her arm hard and told her she'd better watch out, if she did that to any other children. Don't know how much English she spoke but she slunk away pretty fast. DH was absolutely mortified.
I have actually tripped people who shove my children, then when they look back and glare, I smile sweetly at them. I mean, not my fault they tripped over my foot, is it?
Handlers are only as involved as they want to be. At DisneyParis, saw a nasty little boy shove a candy wrapper up Perla's "nose" and the handler did nothing. Perla kept turning away from him but he kept doing it....he was about 9 or 11. Finally she gave the boy a little push and started walking away. The handler just stared into space most of that time.