I've been comparing go to scala lately and what has really got me into go is the development speed. The fast compiles and fast web page auto-reload make it feel every bit as fast to develop in as ruby or python or php, but with type safety, fewer tests, and very clean code.
Scala is a fantastic language, but even with jrebel autoreload you still have 2-3 second page reloads and a 5 second test suite reload. That seems like a small thing, but the faster I see code change results, the more hooked I am to the process. A 5 second wait is probably enough to get me out of the zone.
With go, on just a default simple test of a small thing it is less than a second to compile/run. In revel, pages reload/update as fast/faster than they do in rails/sinatra.
Oh, and with go, each web request will run in a separate goroutine, so you get excellent nonblocking IO performance without dealing with the callback soup of node.js.
It might just be irrational exuberance because I haven't built anything big and messy yet, but so far go is seriously fantastic and solves a lot of real world problems elegantly.