I’m with you in that minority. Increasing the screen size beyond 4”, regardless if the overall size of the device stays the same, will only make it harder to reach all corners of the screen with your thumb, thus making it less of a one-handed device. (See Apple’s iPhone 5 commercial.)
I use my phone when I’m out of the house to communicate, listen to music, navigate (audio), take pictures, and look up quick info—that’s it. None of that benefits from having a screen bigger than 4”. (Heck, none of that benefits from having a screen bigger than the original 3.5” size.) But because the overwhelming majority of the consumer market live on their phones and want their screens to envelope their eyes, I can no longer buy a true one-handed phone. Normally I say, “to each their own”, but it’s gotten to a point where it’s affecting me, so I’m very irritated.