They say that
GNU/Linux (hereafter referred to as Linux) is free if your
time is worth
nothing.
I think that it's like the difference between Legos and He-Mans. He-Mans were cool, but you had a limited number of positions and with rough play their limbs would break off. Legos were trippy because you could build whatever the hell you wanted to--but it takes a longer time, involves more work, and requires a greater ability for problem solving. People who don't have structured ways of problem solving won't succeed with Linux at all.
I read an article on CLI recently which was mostly silly, but had one cool line. Say I want to get a listing of all files in a directory that were created in April and send that listing to a friend via email. In a CLI, you would type:
ls -l | grep April | mail myfriend
You can't do that in a GUI app unless that functionality was explicitly programmed in. There's very little ability to chain input and output from program to program in the GUI world. Linux (and other Unixs and OSX to some extent) revolve around the CLI still. This is very powerful.