This is really the only reason that I even own a GPS. (Actually, it's DH's and fortunately so...I'd have chucked it into a ditch by now if it were solely mine.) When I'm out on my own in an unfamiliar area, I like having the map at hand while moving and knowing exactly where I am. Otherwise, I don't use it.
I'm a respectable climber, by virtue of being petite, in decent shape, and because I've trained to climb rather than for sprinting or for long stretches of high power. I'm not worth a d@mn when the road is flat or the wind is blowing.
This is a big ol' case of Your Mileage/Method May Vary. If you want the data, then by all means get the equipment to capture it. But don't feel like you're not a "real cyclist" if you don't have all the bells and whistles.

