It's great to focus on one use case but this is a phone and is used primarily in portrait mode, not as a video player and recorder. Portrait is the orientation that needs to be nailed. Even the entire iOS has no landscape mode. You must hold the device in Portrait mode to even use the device.
And I have no problems using the rest of the entire device in portrait mode. My thumbs reach all corners just fine. I honestly barely notice a difference. I'm curious to see how some of you hold your phones when you use it. I don't have large hands either. I have very average sized hands for a male my age.
I had a 4s prior to my 5. The glass screen felt the same as on this one. My fingers still slide easier across the aluminum back side, giving me the feeling of the aluminum being smoother. If that's not what you encounter then you may just have drier fingers than me. I am terrible with fingerprints and smudges on my phones.