Using the command + on Mac and keep the active area in the center of screen.

[Greg@AshwoodPhotographics]

I have one request for a possible 'improvement' in the work flow on Photo.

If you are working on a particular area and if you zoom into it, say 300%, you have to move around to get to the area where you are working. 

I suggest, to keep your active area in the center of the zoom all the time.