The big upshot of Jekyll for me is that I can use Ruby plugins, and that Ruby allows me to do Crazy Stuff™ with monkey-patching. This means I both have a "works out of the box experience", but that I can also tweak and customize anything I want, or add new features in an "ad hoc" fashion when I need them – it's the best of both.

This isn't possible with Go, because it's just not that kind of language; it's more or less impossible to have a plugin system similar to Jekyll.

My dayjob is to write Go code and has been for almost 8 years, I think Go is a great language. But I don't think the language is a great fit for this kind of thing.