Sorry, I have to disagree with you on this. No matter how wonderful your kids are (and I'm sure they are), where is the line drawn on this? What is the age cut-off? If my equally wonderful kids (ages 19, 17, 12, 11) want to go talk to the princesses while I wait in line, then cut in later on, is that also OK? What if every family in the line does this? I'm sure every group could come up with many good reasons to justify their leaving the line and rejoining later.
Can you imagine yourself in that line, patiently waiting your turn, yet not ever seeming to move ahead because more and more people keep coming back to join their party ahead of you? It is very frustrating for the people who are waiting. Perhaps the reason it isn't a problem for you is that YOU aren't the one standing there waiting while others are joining the line in front of you.
Being "un-Disney-like" and "negative" isn't the same as speaking out against things that are unfair.