It's only been lightly brushed over so far, but worth making more of a point - it really, really depends what, where and how you ride. Not everyone has aspirations of being the next Sam Hill (or DH hero of your choice). I can't ride with the things. Yes I'm an unashamed XC rider, but when it comes to lumpies I find I ride worse, on bits of trail I know, when the saddle is down. Being able to nudge the saddle with my thighs helps steer the bike, and when it's at knee-height I lose that point of reference of where the bike is.
Short version: if you ride in a manner that makes a dropper beneficial, use it. If you don't get any benefit from it, piss it off.