There has always been a "one handed zooming" solution, but as we see in this thread, people don't see/like those buttons. http://i.imgur.com/TfaGExu.png
Those are also in an uncomfortable place to reach with your thumb when holding the device once-handed — and might even be covered by the thumb, depending on how you're holding it.
You can also zoom in by double tapping on the map. This gesture usually performs a "centered zoom" meaning that the current center of the screen will remain the center of the screen after the zoom has taken place (unlike when zooming with the pinch gesture).
