Seconded, though I don't mind Erlang as much as some. The most complex stuff I ever built was built long before I knew about Erlang (and before Erlang was available to outsiders afaik). Message switches and other distributed systems would have been impossible with the degree of reliability required without the kind of architecture that message passing enables.

I did it using QnX re-inventing quite a bit of the Erlang philosophy along the way, if I had had access to either Erlang or Elixer at that point in time I would have been overjoyed, that would have saved so much time.