You say this, but have you tried an old iPhone recently? I did, and it was actually pretty terrible. The quick little swipes to switch between apps is so much more natural now.
Perhaps if you know how. Watching my dad use his iPhone.. Every time have to teach him something new, and hope he remembers it.
So stupid interface. No discoverability.
Yes, my wife has an iPhone 6, I wish I had that. Though half of that is the jack.
Try going back to thumb typing, no long press symbols , and no cursor movement from your spacebar. I've almost thrown my test iPhone at work across a room more times than I'd like to admit (since it doesn't belong to me)...