Terminal isn’t over complicated, it’s the most basic interaction with operating systems and was the first mainstream UI to ever exist because it’s a natural extension of what interacting with a computer truly is.
Terminal has very basic, particular syntax: Command <optional parameters> [required parameters]
It has some useful additions as well, like
| to pass the output of the precious command to another command
> to write to a file
< to read from a file
This basic structure allows additional tools to be installed and run without having to learn a unique GUI with all the quirks of the GUI designer for each application. You just add new commands and move on with your life, maybe referencing the manual page to check which parameters you need.
Windows has a very particular GUI design that everyone knows because of the way Microsoft captured the market in the early days, before laws prevented them from doing so. Windows is esoteric, it has a variety of GUI philosophies all jumbled together. Explorer/control panel exists next to “Metro” apps, now “Windows apps” and they both do separate things without ever integrating the two properly.
Windows is arcane and understanding it fully is thousands of hours of practice, if you actually try new things. Linux is perfectly usable from command line with just a few dozens of hours of practice.
I say all this as a primarily Windows desktop user who uses Linux when it comes to actually getting things done. If we taught Linux to our children in schools and if businesses provided as much Linux training to workers as they do windows training, the discussion we’d be having would be about how windows is too complicated and just needs a UI similar to the ones available with Linux.
Probably? I didn’t check on whether angle brackets or square brackets are for optional parameters. It’s an arbitrary thing and my meaning is entirely decipherable in any order.