So I wondered that as well and did some Googling.

Found a blog post by Joel Webber, who I have not heard of, but he was working on a minecraft clone and had some advice on avoiding GC and memory layout:

http://www.j15r.com/blog/2015/01/25/Game_Development_in_Go

Also found an engine, Azul 3D, and they made this claim:

https://azul3d.org/doc/faq.html#what-about-the-garbage-colle...

Then there is termloop, which is a terminal based engine:

https://github.com/JoelOtter/termloop

Fun for indie game stuff.

So, yeah. There's that.