First, I'd never get into a 30-45 minute line with my kids unless it was for something they loved. Second, I'm sorry if my parenting technique somehow infringes on another guest's vacation experience, but I don't give into tantrums at home and I'm not going to on vacation, either.
We've had 4 trips to Disney. I mentioned the three times in riding 100s of rides on those trips where I had to take an objecting child onto a ride. On the LM, he objected all the way through the queue--the FP+ queue, that is, which we walked right through. A couple of minutes at most. On Splash, he said he changed his mind right as we were getting into the ride vehicle (he was fine through the queue)...I told him it was too late and he was going on the ride. On HM, he objected once we got through the stretching room and he saw the doom buggies. I told him just to hide his eyes and that everything would be OK. Once on the ride, there was no crying/fit throwing. Why? Because his tantrum didn't accomplish its goal, which was to get us to do what he wanted. It wasn't necessarily that he didn't want to ride, but he didn't want to ride on someone else's terms. Mama don't play that game, vacation or not. Just because it wasn't his turn to pick the ride (everyone takes turns deciding where to go next) didn't mean that he was going to derail the whole family.