I'm a somewhat advanced user of Git. My coworkers use me as a reference when they have a problem of a difficult merge to solve. I don't follow each Git release, but I also didn't notice a great productivity enhancement for a long time. Sure it is a sign of a mature project, but I'd like to know: What's the somewhat recent Git feature that you really improved your productivity?
git range-diff
Very useful to get an overview of what changed after a rebase.