Sure, using the Linux command line is optional. But these are commands I rely on every day, and you can benefit from them, too.
The terminal may seem powerful, but it's not always as good as it sounds. Learn all the misconceptions of using the Terminal vs using the GUI ...
If you want a more genuine Quake experience, you can set the keyboard shortcut for Yakuake to the ` key (sometimes notated as tilde, ~ ). To do that, you'll need to hit Ctrl+Alt+, (comma) and scroll ...