I'm sure I have been guilty of oblivion, but as PP stated I try hard to make up for it by generally being polite and consider and hope the balance comes out positive. But ...
If anyone was on the Frontierland Railroad station platform in August of 2013 around 9:45 and witnessed a woman telling her DH (and 3 children) in no uncertain terms, not quietly and in an aggravated voice that yes, it was hot, we'd come to WDW in August and not for the first time and therefore what the heck did they expect, and if they thought that arriving at MK going to Splash and leaving instantly they found out it wasn't running was a great idea they had another think coming and we had to stay in the park at least as long as it had taken for us to get there from our our lodging .... that was me.
Definitely not my proudest moment and I still cringe when I think of it, but the irony is that I am the only one -- the rest of my family later told me that I was right to make them stay because they had a great time, and 2 years later nobody but me from my family remembers it at all.
Just to be clear, it was DH who was like "not running, let's bail" ... if it had been the kids I would have been more sympathetic to possible overstimulation etc., but that's really not what was going on. I don't really know what was going on, but it wasn't a case of being parked out and just needing some down time.