Hugo is a single executable - it doesn't require any knowledge of Go itself. Granted, you have to be familiar with the templating syntax to add build-time logic to the website, but I believe that syntax is common across many other static site generators as well.

Yes, if you want to add logic in addition to the templating primitives provided by default, then being able to write code into the source pages will be of great help. However I think that when such a level of dynamism is required, then one can start debating the utility of a static generator in the first place.