Every task? If I want to rename all of the .pdf files in the folder to .avi I would just do it in the command line
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?
The GUI for that is called file manager, there are quite a few available and they can be far more sophisticated than an ad-hoc command pipeline. If you manage your files on a regular basis (manual sorting, metadata, mass renaming etc), you already have a serious file manager that allows you to do this.
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)
There are these things called programming/scripting languages, look it up. python for example.
And you end up with very short and simple - and most importantly - human readable programms instead of cryptic Unix two letter commands with bunch of arcane single letter flags and other legacy pdp11 nonsense from 1970ties
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?