Maybe the effort just isn't where you're looking? Intel provides the Threading Building Blocks library for C++; some top notch debugging & profiling tools with multi-threading support; very good documentation; and they do quite a bit of community outreach to educate about and promote multi-threaded programming. (I'm not affiliated with them, just grateful for all of that stuff!)
Haskell is used for critical projects in production at Standard Chartered, Barclays and Facebook. There are also numerous startups. For both parallelism and concurrency, Haskell has a particularly good story. There's now even an O'Reilly book: "Parallel and Concurrent Programming in Haskell"
