I work in Go full time, so i don't know if that counts as without prejudice. But I do not think it is fun or particularly productive (if measured by the amount of stuff i can get done in a particular set of programming time). I'd say I haven't used a language I was less productive in or that I enjoyed less since Java 1.

What I think Go has done for me, is crystalize a belief I was already leaning towards, which is that a language being productive or fun is a lot less important than standards cutting through the issues that don't matter.

Not arguing about the best way to format code, or which test library to use, or how to share memory across threads is what makes Go valuable. It is implied that the language has to be this bad to achieve that, which is the open question to me.