They annoyed every one because they were too loud! Especially when they got into the beer!
There are lots of rumors as to why River Country closed -- one of them involves health concerns which makes some sense since all the other beaches closed about the same time. BUT, I think they still occasionally use River Country for some special events. I may be wrong about that but I know I saw it mentioned somewhere. One of the other reasons given for the closure was that they couldn't compete with the other two water parks which also makes sense. Whatever the reason, it was a neat place to go and I miss it.
They weren't removed by disney, most of them made an untimely demise due to getting hit by private golf carts driven by kids smoking. Or at least that's what the guy told me who was cleaning the site next to us.