I used to use cases all the time. I have about 40 cases/bumpers total and feel like it was a waste of money now.
One day last month I was switching between cases and decided to try using the phone naked for a couple of hours since I was just at home and figured nothing bad could really happen in a few hours without a case. Wow. The phone feels much better in your hand without a case. I haven't put one back on since then.
I do have a different back on my phone than the original glass one and I do have a front and back protector too. As close to naked as my phone will ever get.