Team friendlyness, simplicity, readability, tooling, native compilation, built in syntax for concurrency and really fast compilation times for large projects.
Few of these, honestly, benefit one man side projects. If you want to learn Go (for whatever reason) its fine, but otherwise I personally would prefer more expressive and less dogmatic language.
Two people see cool sideproject in Go, his thoughts "damn this looks good, I need to learn Go", my thoughts "Whyyy you do this in Go and not D? Simplistic Go has no strong sides here! Why nobody promotes my favourite language with things like this, it deserves hype no less!"
I guess it's because no one is writing anything "cool" in D?
Simplistic Go has a lot going for it - focussing on knocking out cool projects rather than the minutiae of build/package/dependency systems is one of them.
Its because D has way less developers, support and, consequently, way less hype, than a language backed by one of the biggest world corporations in existence.
Anyway, care to elaborate whats wrong with excellent build/package/dependency system in D called Dub? Never had any problems with it.