As someone who has grown up with and still love Theme/Amusement Parks (Native SoCal) and have been to way too many different parks of multiple chains including Disney, Six Flags, Cedar Fair, SeaWorld/Busch Gardens (how I miss the Los Angeles park), and other smaller chains.
One of the strongest memories in regards to crowds and "locals" was my first trip to Cedar Point (Ohio) as an adult. Since it is mainly a local/regional park (though it is becoming a bit more of a tourist location) and focuses on roller coasters. Even queue I was in and loading platform was fast, and efficient. When folks sat down in their seats, it was amazing to see how fast they got the safety devices attached and hands up to allow checking of them. It was almost a challenge to see how fast you could load the ride and get dispatched. If you took your time, well, there was some group pressure to get with the program, and save it for when you are out of line. Amazing to see, and made the lines move quickly.
As compared to
Disneyland, where it was just hanging out and hanging out with friends.
As for Six Flags, some parks in the chain are better than others, and I have also had some of my best experiences at their parks, park employees that have gone amazingly out of their way. Heck, Wayne Brady worked at Six Flags, Terry Favor worked at LEGOLAND California, the amount of folks that worked at Knott's over the decades is too long to list, and today, many employees work at both Knott's and Disneyland, especially performers.
And then we can get to the stroller complaints,it is the locals that bring in the strollers the size of a small car and block pathways. I remember once at Disneyland, sitting on a bench talking to friends,and got my foot run over by a stroller. I looked up, and Mom looked at me like "Hey, why did you put your foot out in my way attitude", even though I didn't move it at all, and was sitting normally. Every park has good guests and less than great guests.