I found Revel to be quite similar. I would say it is as productive as rails too. There is no ActiveRecord and way way less magic which slows (initial) develop

I found Revel to be quite similar. I would say it is as productive as rails too. There is no ActiveRecord and way way less magic which slows (initial) development speed but it pays off in less bugs to fix. So overall development speed is roughly the same. But with Go you gain co routines and nice performance which can make life a lot easier. Gos type system, while somewhat poor, still helps too. The worst part of the whole thing is actually the weird Go std lib templating.