I am not sure what you find unappealing about those websites, but I find Go’s website very easy to navigate and for browsing the standard library. When looking for software to depend on, I think I prefer a visual design that does not attempt to be in any way “mysterious,” but rather simple and predictable.
I made an uneducated guess for why sgdesign disliked golang.org’s web design. I think an unearthly visual design is more appropriate for adventure games, less so for software tools. That does not mean that only “mysterious” visual design is good visual design.
