(Since this is basically now a comment where everyone "me too"s in a reply...)

F# also has facilities for this, depending on what you're after. The _MailboxProcessor_ type, though not as "for real" as the green threading in Go, allows for some pretty high throughput with a relatively sane message-passing abstraction.

And .NET itself offers many means to do parallel programming (which can get quite optimized), of which F# has some nice abstractions for.

So I don't think it's quite fair to say that only Go and Erlang have good support for parallelism. I also don't think they use their abstractions typically for parallelism (but I good be wrong).