So, for probably 90% of the type of photography I do, I am using manual focus. There are several reasons for this, but mostly it allows me full control and consistency from shot to shot.
I manually focus for all of my Landscape shots, HDR shots, Macro shots...pretty much the only time I use auto focus is if I am hand holding and my subject is moving...so not much ;)
Often times people will ask about my method of manual focus and I tell them I always use Live View Mode on my camera. Again, there are several reasons for this, but the biggest two are the ability to zoom in on a scene to dial in very fine focus detail and my failing eyesight.
Here is a video that is a segment of a longer video I am trying to put together and I thought I'd share it with you. In this example, I am using the Sony A7R camera body, but I go through the exact same procedure with all of my Canon DSLR bodies, too.