I mostly find only the former camp interesting*.
Because of that, it's easy for me to forget there's this whole other group of people who e.g. concern themselves with the corners of C++. But I work with some of them and they have discussions on mailing lists that link to A Proposal to Add Move Semantics Support to the C++ Language.
I can read that and know that it was written by language geeks (and be amused by the section headed "Binding temporaries to references") but ultimately think those geeks and geeks like me have nearly nothing in common.
* One of the most interesting aspects to me of O'Caml is that the guys who make it are these crazy language theorists who also happen to be architecture/performance nuts, and so their language is carefully tuned to suit aspects of both. (Theory: Coq, which comes from the same institution and is written in O'Caml, was recently used to verify the four-color theorem proof. Practice: Xavier grumbling about IA64 and how to optimize O'Caml for it serves a random example.)