What I like most about go is its simplicity and cleanness while still allowing you to program somewhat close to the metal. In fact, it often feels considerably more like a higher level language than a systems language.
The go tool is quite fantastic too. My chess engine project folder contains 41 go files, including a number of files containing tests (named XXX_test.go) which contain functions named TestXXX. My entire test + build process is:-
~/gocode/src/weak$ go test ./... && go build
Go is very unassuming. You start by wondering what the big deal is + getting annoyed with the minor differences from other C-syntax languages before slowly progressing towards quite liking it, then eventually once you grok how simple + elegant and well engineered it is you come to love it.