I don't exactly "use" it in maps, but it's influenced all my maps since reading this I think. The only one I've posted is Golden Valley, which doesn't exactly do it. I came up with that concept, at least partially, before this thread came out, I think, and I didn't really do anything special there, although there are some decent chokes and high grounds.

I have more maps in progress with the use of high ground and chokes, experimentally. I was planning on posting some of those today but I got distracted starting a new map. I'll likely post them tomorrow.