Unless I have to shot a person or an object which moves, I set my camera to use only one focus point at the middle.

It feels just more natural and so easy: when I need to focus on something which is not in the center of the photo, I start by focusing on it, then move my camera to take a shot. When doing otherwise, I failed to capture numerous moments because of the camera deciding to focus somewhere else.

On the other hand:

* My Nikon D7000 has 39 focus points, and newer and more expensive cameras have even more. Also, the factory settings are to keep all the available focus points active, including, I believe, on professional cameras such as Nikon D4.
* I often see people doing DSLR reviews keeping all the focus points active.
* [Ken Rockwell suggests](http://www.kenrockwell.com/nikon/d7000/af-settings.htm) keeping the default auto-focus settings, highlighting the fact that the camera figures very well which point should be used to focus.

Have I misunderstood how to use properly all auto-focus points settings? What could explain that I find it much easier to use a single focus point, while it's not the case for many people?