Other reasons I prefer the CLI (most of the time):

- awesome cross-platform window management (tmux, screen etc)

- a commonly used standard: one programs output is another programs input

- program availability (there are many programs that are only available on the command line)

- i can access the history of my previous actions

- less data to transfer when working on remote machines (seriously!)

- i find the CLI-interface to be more visually consistent (less colors, more constraints)

- ... and many CLI-programs are theamable should the previous point not hold entirely true

EDIT: formatting