I've never learned it, but watching it is boring and I even fought my brother who learned karate and I still won just by blocking him and pushing with my hands. Not that hard.
I agree with you, I too don't see the use of it however I do find it interesting, but only in movies.
I have a friend who practiced a martial art (I forgot what it was) I manage to beat him by grabbing him and throwing him to the ground. There's also this bully in school who was showing off his "skills" he later tried to take my pen for whatever reason...then I stabbed him in the hand with the pen. Basically martial arts don't really do anything.