I don't find the backlighting too bright - the lowest setting is farirly dim, and I usually use the second or third setting on my Ducky Shines (where the highest setting is waaay too bright.
For a new game or one with many keyboard controls, having backlighting means that I can glance down for a second to see where they key us, as my fingers are usually poised over the wrong side of the keyboard for touch typing, so until muscle memory sets in I can easily find the keys. Gaming in a dark room, btw, where the legends are all but invisible without backlighting.