One of the most powerful aspects to Go are its interfaces. See http://talks.golang.org/2015/json.slide for some mind blowing ideas for JSON decoding.
A perfect example of how lovely Go can be:
This code is from Gondor's router during spin (being ported from original Python so not complete yet.)
Go's func keyword was originally function. During a meeting with Larry Page and Sergey Brin, Larry said it should be func.
Source: Rob Pike during his keynote at GopherCon 2014
What impresses me the most are I/O streams, networking support and goroutines. The combination of those three things is absolutely mind blowing.
I haven't used a statically typed language for anything serious in the past. Most of my experience has been with Python (a dynamically typed language.)
I am beginning to see the benefits of a statically typed language. Especially as the system grows. Type checking is extremely useful and starting to wish it was there in Python.
The more I think back to many of the bugs fixed in my Python web applications I realize they would be non-existent in Go.