I find my smartphone to be an indispensable tool. It's my still camera, it's my video camera, it's my appointment book, my watch, my GPS navigator, map, bus schedule, universal communication device, music player, calculator, compass, and any number of other things. Sure a lot of people use them for pointless things but what else is new? It's not as if people didn't find ways to waste time back before smartphones. I lived a majority of my life without them and I've always known loads of lazy people who found pointless stuff to do.
It's not that I absolutely need one, but it sure is a convenient tool and it beats carrying around a pile of gadgets and hoping I have the one I need when I need it.