I find editor usage quite interesting, in fact. I’m responsible for mentoring and training other developers, and mastery of an IDE is the easiest, biggest win you can get for productivity.

How do I easily attach the debugger? How do I jump between recent files? How do I use column mode to fix a bunch of sample data? How do I jump between file and test?

Junior devs by and large can’t do any of these things, and it has a material impact on work output. So I teach them.