"go get" on its own isn't to blame -- the culture folks behind Go are trying to promote is that dependencies are intrinsically part of your code and thus you have to maintain them. I'm not going to say that version pinning harms this, but the lack of it is no reason to throw away good conventions around imports mapping to URLs, etc.

For a set of alternative package managers that are perhaps more in the "spirit of go get", see https://github.com/golang/go/wiki/PackageManagementTools