For me, it comes down to one's affinity with the command line. I've known developers who use an IDE but who are still very fluent in the command line, and in fa

For me, it comes down to one's affinity with the command line. I've known developers who use an IDE but who are still very fluent in the command line, and in fact could probably do just fine if you took the IDE away and made them work in Vim for a while instead. The problem is when a developer can't make that jump when necessary. A big part of our ability to build systems for computers relies on our ability to traverse those computers at a low level, and that means command line instructions. It means being able to work with the filesystem, and streams of input/output. I don't use Vim because I think it's a superior text editor, I use it because of the fluidity it offers me in terms of getting streams of text from the console in and out of an editor. I can just pipe things to it, or execute arbitrary commands and capture the output, and so on. Now, granted, seasoned developers can often get that same degree of command-line fluidity while still working in an IDE. But I think that requires them knowing the importance of that fluidity in the first place, which is something that you aren't necessarily going to learn as long as the IDE is holding your hand and doing a lot of it for you.