Something people often forget to consider when they talk about all the benefits of being an editor power user: how often they get distracted or go down rabbit holes when tweaking editor config or using advanced features. I've worked with people who seem to spend half their day on this stuff.

So while it can certainly be impressive to watch someone who has mastered their editor, I always secretly kind of doubt that it's really much of a productivity win for this reason.

I think there are huge wins for getting proficient with your editor (refactoring commands, debugger, etc. as John Carmack mentions), but sharply diminishing returns beyond that.