I'm learning OCaml now and this blog post really makes me wish if tooling around js_of_ocaml[0] were this great! Thanks for the detailed write up! Bookmarked for when I start clojure!
I hear the maintainers of Cljs are going work on it but its not a priority.
However, you can still get to a very usable state with a minimal setup. Once you get lein-cljsbuild set up, just running 'lein cljsbuild auto' and reloading the page after changes works fairly well. No, it doesn't have the polish or Vim integration of this full configuration, but it's usable.