Haha, the illuminated keyboard sure is nice. To be honest, back when I had a Dell laptop I always envied the illuminated keyboard in Powerbooks because I often used my laptop in the dark after my girlfriend had gone to sleep and could never find the keys. However, since finally getting a lit keyboard in my MacBook Pro last year, I've virtually never used the feature and tend to just turn the brightness right down anyway to conserve battery. For one I hardly ever have to use my laptop in the dark anymore and for another, the screen is so bright even on minimum brightness level that I don't have a problem seeing the keys.
If anything, I wish Apple would allow the screens to be set to ever dimmer levels on both their laptops and their iPhones. Honestly, I could happily have my iPhone set to half the brightness it currently has on minimum level when I read books on it in the dark in bed.