In my opinion, the lighting is for other people to look at, or to create some sort of ambience. I'm not really a fan, but I do like the idea of having all the led's controllable (like on the proposed "light" keyboard that we're making a reality after the phantom.), just for all the options you get with it.
Also, I totally look at my keyboard (one of them at least) when typing, but there's really no reason for me to learn to touchtype QWERTY.