One time, when I went to work, I accidently left my cell phone at home. That day sucked. But the thing is, I don't need my phone. I can turn off my phone for a week while I go backpacking, but day-to-day? I guess I am addicted to it. If my phone was glued to the wall, my life wouldn't really be different. I could answer texts/emails when I get home. I could read a paperback book if I'm waiting for something when I'm out. The GPS/maps/directions would be the biggest loss.
I have to remind myself that for years, I did ok without a smartphone. And I didn't get one until 2012 because for a long time I didn't feel like I needed one.