We communicate with people via language more often than by pointing and grunting. Is it a surprise then that a command lines provide expressive features that point and click do not easily duplicate? Consider further that even most point and click operations are really just pointing at words (menus, buttons, labeled fields).
There are plenty of valid use-cases for point and click. Take graphics software: I could type postscript I guess, but I will take the mouse, thanks. Point and click is also more discoverable (when done right) than a command line.
Once you get to complex operations (especially chained together) the expressiveness of words trumps pointing and clicking. Note the many failed visual programming systems that have come and gone, or the fact that even graphics packages allow scripting by recording commands to a command list.