I traded happily to Haskell where I get my category theory, my light pool of processes, my HM type checking, my functional programming. I miss OTP and soft-realtime and would go back to Erlang in a heartbeat if I needed those---I may, indeed, use it to write one of our API servers, but I just don't see using it for projects where soft-realtime and asynchronous processing isn't the central conceit.

I would, for instance, never write an embedded language or parser in Erlang, but I do it constantly in Haskell just to play around with ideas. I also think there are opportunities for other kinds of powerful parallelism in Haskell such as the Par monad or the Data-Parallel stuff. Those things would obviously be possible in Erlang, but I think not worth the trouble.