I'm not the type to be all "let's put my dogs in a park with a bunch of crazy, snappy dogs and cross my fingers" either. And I'm fine going to my dog park because that's not what it's like.
Same here. My dog park is several acres of wooded river bottoms. It's meant to hike through, not stand around and watch dogs play Thunderdome. Everyone is moving rather than congregating and there is ample space and visual barriers (vegetation) to stay away from others, and I have never seen or heard of a serious problem there. Maisy still can't go because she can be a big fat bully, but my boys get so much out of it that the risk:reward formula comes out in favor of going. (I have also been to Linds' dog park and it's a similar design.)
I wouldn't go to the ones that are essentially a big fenced yard, I think those are asking for trouble. But a dog park is not a dog park is not a dog park, so it's not as simple as asking "why do you go to A dog park?" I go to MY dog park because I get a nice long hike out of it, and my dogs love it and get a great deal of physical and mental exercise, and they can swim. In particular, it is Pip's happiest place on earth and he minds his own business there, so the risks are just incredibly low and the rewards high.