Linux geeks love the Command line, because it is simple, fast, cool and highly intuitive. Besides, it offers more options to do certain task. For example, compare video encoding in mencoder (the cli program that often comes bundled with mplayer) with any other gui application. Using mencoder you can play with encoding changing the parameters the way you like, but while using a gui applications you can use only the preset values.
Well, those who are unfamiliar with command line interface (CLI), don’t blame it on Linux. Forgot the old DOS ways of doing things? Don’t you remember that MS DOS which was as much cryptic as linux terminal, but unfortunately less powerful.