I agree with the Park Service. Too many people doing it! And for what? A lot of middling-to-good images. It's not hard to do, and the effect is often stunning even when badly done - hence the popularity. I say this, and I'm a photographer and would love to play around in natural areas. But I don't. I respect that wilderness needs to stay wilderness. It's not just ruining the experience for other humans - the question is, what it is doing to the wildlife. The tyranny of technology is over the top, and needs mediation.

Later note: I hear people say, "Yeah, but they do it in the desert mostly. Nothing there." Ignorance. A square meter of desert contains more biodiversity than a square meter of East Coast forest.