Yeah but I feel like if I'm going to use Qt I may as well write it in C++. Part of the reason I like Go is that it makes easy-to-distribute binaries. Adding Qt back in gets rid of that benefit.
A friend used walk (Windows-only, as other comment says) for a commercial project. AFAIK it worked okay.
There is also shiny, an experimental one from the Go team; not checked it, and may not be production-ready yet.
Shiny is missing a lot of desirable features (full-screen, window positioning, disallowing window scaling) and is no longer being maintained, unfortunately.