Once I stopped using windows, it turned into a useful key!
All of you happy people who only converse with other english-speaking users never have need of such complicated non-standard keys such as ç á or äÖ...
Neither do I 99% of the time. But switching keyboard layout to write a quick mail is a serious pain. Linux and the caps-lock to the rescue!
Really, it is such a drag to do it any other way, I still smile inwardly every time I write one of those letters, thinking to myself what a &*%*# mess this used to be ;)