One of the things that was fantastic about vintage PCs is the way your hands never had to leave the keyboard: everything was just a command away. The graphic user interface first introduced to the world with the Macintosh is obviously a big step forward when it comes to general accessibility, pointing an onscreen at an object to click on it can often be a step backwards when it comes to speed for die-hard power users.
If that sounds like you, Shortcat is a new, free app that you should download which aims to bring the command line to the GUI.