[mdasen]

Possibly Scheme or Racket? S-expression, functional languages don't seem to accumulate language features at an incredible rate (but I don't use them frequently so someone might correctly contradict me).

I too like Go's restraint. It really doesn't want to give you a tool to make a one-liner that is easy to conceal a bug. For example, Go's increment (eg, i++) is a statement, not an expression. You can't do list[++i] or anything.

There are parts of Go that I'm less a fan of, but they keep a nice eye toward making sure that the code is understandable and reviewable.