I don't know about companies using it, but here's the django equivilent... totally confident it's a production ready replacement for django, RoR, etc.
Ahem...
http://golang.org/pkg/html/template/
It doesn't have its own equivalent of RoR or Django yet because most of the batteries needed for web development are built-in.
It seems that the web.go authors thinks that Go's template language batteries are of the wrong size.
What you're looking for is Revel. http://robfig.github.com/revel/