Clojure for one! But I thought it was a common complaint that Go's lack of support for generics and other language design decisions aimed at keeping things easy make it much more verbose.

That's just a non-user's perspective on the scuttlebutt, though - I don't have any actual experience with Go.

Haskell would be an example of a language that is terser and more expressive with comparable concurrency primitives.

I didn't mean the concurrency, just the language in general. And verbosity isn't always a bad thing. I can dive into pretty much any Go codebase and get a good idea of how it works pretty quickly, and that's been a pretty unique experience for me.