I do too.
I dont have kids of my own...but I taught kindergarten for a while.
It's a fine line between helping a kid overcome a fear and traumatizing them.
I applaud parents that walk that line every day.
I don't know if it's a fine line, but I am all for giving my kids new experiences. Mine are still young, but the eldest (DD6) is asking lots of questions about the "bigger" rides at WDW. We explain each part of the ride and she seems interested, but who knows how she will react by the time she gets there again next year. She may go on without hesitation, or she may resist entirely.
Right now, DS3 is going through a stage of being afraid to eat new foods. Nothing scary (spaghetti sauce). He will melt down at the table if we put it on his pasta, but he will devour pizza. Go figure.

We just keep trying and eventually he will eat it.
So the same goes with rides at WDW. Keep trying, as long as everyone is safe I see no problem with encouraging (or bribing) your child to try new and different things. Heck, I bet if you talk to a CM and explain how your child is a bit scared they might be able to help them understand.
It's hard as an adult to watch kids have melt downs and parents react badly. You want to help.
In the end, you as an outsider have NO IDEA what the circumstances are behind both the childs and/or adults behavior.
If you are worried the bad behavior will affect your enjoyment of the ride, then let the people behind you go ahead of you.
