The :Drop, :Import, :Gofmt and :Godoc statements that allow you to drop packages, import packages, cleanly format what you're working on, and document the targeted function are in the vim extras that come with Go, and work well enough to make this painless for me.

I don't know for Andrew, but I use Sublime Text 2. Cmd-., Cmd-P and type the import name, you're done (it toggles add/remove of the import). You don't have to leave your position in the file.