Post of the week here, for sure. You're so dead-on. Every single time at the Magic Kingdom, my wife and I always say that they act as though they've never done this before, even though they do parade traffic flow nearly each and every night and have done so for most nights of 40 years. It's chaotic and downright dangerous. There's nothing like a bunch of obnoxious people nearly trampling your small children because they have no manners nor do they have any respect.
ECVs... My dad has two debilitating diseases and has a custom electric wheelchair, but chooses to only use it for long distances. He hates having to use it, but he has no choice due to his medical condition. All the meanwhile, you're constantly watching out for people running you over in the ECVs all because they are the "Wall-E" types that are too lazy to walk. And strollers, yup. How about not taking your running stroller to the park? Or do what my kids did when they were little, walk. They liked that. I have a two and a half year old that since about 16 months could care less about the stroller. We try to get him in it during vacation to have him relax and not get exhausted and then cranky from walking.... but he generally chooses to walk, and yes, it's a slim stroller, not a small tank sized one.
As for your Les Miserables experience noted above, it's like our trip to Target yesterday. These people are not in line, they have their cart facing horizontally by the end cap between two registers (yup, not in what most people consider a line formation) and are audibly complaining to each other about buying something and trying to decide whether they buy it or not. I pull our cart in line and they flip out.... Then the guy says that well, they weren't actually in the line, so we can go. Well isn't that nice? All the while they looked all ticked that I was going into line where, um, they weren't standing and they were doing us a favor. Sometimes I wonder why we even bother going out anymore. Welcome to our ed off America. Ugh, it stinks.