It would be fitting to have an equivalent of Fugitive's :Gbrowse to see a file on github and :Gblame to see the blame inline. Never understood why would your editor should be aware of git until I used that.
Yes! Gblame is fantastic. Xcode also has some pretty good git blame, git log, and version comparison support directly in the editor. I find that kind of thing fantastically useful for understanding why a section of code is the way it is.