I haven't written much Java professionally (I know the language, I've used it), but I have written tons of Javascript code. I have to say - Clojurescript just makes much more sense. Java and Javascript are good as low-level languages for their respective platforms. But if you want to build something practical, Clojure really is much better.

And by the way, demonstrated Clojure code is very unusual. Nobody in practice writes anything even close to that. Java interop is baked into the language, but in practice it doesn't look as scary as in the blogpost.