None of this would be an issue if they all went through the line and then switched immediately after the first adult got off. I think that system works the best. I think Disney was doing people a favor by letting the child/children and the other adult go and wait outside of the line so they can be more comfortable and maybe use the restroom or entertain themselves in another way. That is what they get for being nice. Yes parent guilt is a real thing. But it started recently when people stopped disciplining their children and allowed them to be an annoyance to others. People used to teach their kids how to behave in society. I have kids, and both of them had their meltdown each at Walmart when they were toddlers. But only the ONE time each. I picked them up screaming and took them home, disciplined them, put them in their rooms and when Daddy got home he gave them the business. They never did it again, ever. We were also very aware of them, especially at places like WDW. We payed attention to their needs, made sure they were fed and hydrated and rested. It is hard work being a parent and you can not take your focus off of them. That is why, especially when they were little, we did stuff that was for them, so we did not drink or worry about going on the big rides. There is plenty of time for that when they grow up. Our main focus was our kids. But at the same time they know that the world does not revolve around them. We taught them to be mindful of others. We did not allow them to be loud in the hotel rooms or to just wander without being aware of other people. We are not the type of people to just stop in the walkway. Kids will be kids and I don't judge the ones that are having a meltdown, it is how the parent handles it that is the main thing. If they just ignore it or give in to them, that is what perpetuates the problems.