I was at first apprehensive about upgrading to bigger phones. But I realized something. I spent a lot of time surfing content, texting and consuming media (YouTube etc.) than I do casually checking the phone. If I text one handed I swipe. If not, I use my hands. I rarely had to use both hands with simple tasks. It's thanks to the numerous updates to Android that allow me to do a lot more with one hand.
But the fact was...I used both hands more than I ever used one hand. In the off chance I used one hand, sure its awkward trying to get more complex tasks done but then after that one task its over. I had to find out which was more important. I found the the little time I spent doing one handed tasks was fickle. And that having a big screen allowed for more enjoyable experience when watching videos and reading articles, taking pictures and viewing them.
At the end of the day, I enjoyed a bigger screen more. The little time I did use one hand, there was always a way for me to get it done (adjusting the phone in hand, etc). I spent more time with two hands, then I did with one.
I remember my brother and sister would always show me stuff on their iPhone 5s and it would just be a horrible viewing experience.
Ultimately its why Android has buttons on the bottom. Instead of just one, and having to reach to the top left to do stuff.