Or would you rather have me google a GUI that lets me "quickly rename" and download a few programs that have this capability? Or do a few hundred files by hand?
Command line is... fine for doing this occasionally, but it's hardly "quick" or usable for this, I'm saying that as an advanced commandline user. You're just using the tool that you already have and know, and it happens to be the system shell. It doesn't have to be.
(another question is that classic file management at the scale where a sophisticated tool is needed is mostly automated nowadays, and yes there's scripting as well)