There's lots I could say about this topic, but I'll limit it at the moment to talking about line stallers. The way I see it, the line is moving at more or less the same pace, depending on the ride of course. Yes, there can be delays, but overall there's just a pace to it. Now, if someone holds up the line for a minute or so, whether they're distracted or trying to wait for someone or whatever, yes it's annoying, but unless everyone ahead of you and them get on the ride and you're still stuck behind them, then I don't think it's as huge a deal as some make it out to be. You still wouldn't have gotten on the ride right that second, so why get all bent out of shape if you continue on the same pace or you get held up and then catch back up the rest of the line?
Having said that, I can get as hot-headed as anyone if the line hold up is for the one person to let their entire extended family into the line because they were too lazy to all get in the line together. Even so, why let that ruin your day? I'm certainly not saying it's ok, but if you get so frazzled you can't enjoy anything or potentially lead to a confrontation, that's a much worse outcome than just letting it roll off your back and enjoy the ride and the park.