Where we have frequently stayed in Michigan, is where I have seen the most damage. Sites on the lake People come further and stay longer, or not. Watched an RVer roll out his mat for only the weekend. Grass was dead and gone on that site right at where everyone's awning is door to the coach or other RV and in an almost uniform pattern as if everyone used the same size mat. Our site we have used it before. I even got permission to water the site, when it was real dry a few year ago. Considered getting some grass seed and straw. If e had been there for a month more I would have. Sure the straw is not ideal but grass comes up quick on that soil and in two weeks we would have had a lot of green. Of course the next RVer might put down a mat and kill the grass. Grass has been gone in a rather uniform patch there too for some time. I know when the original Owner was alive, I believe they sowed grass in the fall. They close down except for permanent stays in October I think.
I keep hoping they will put in concrete pads/patios. There was some conversation they ere considering it.
Best of all worlds is up near Travers City and nice pads/patios, lots of grass and flowers ponds and ducks. Cost quite a bit and perhaps all the sites have sold by now. You gotta pay for what you want.