Originally posted by Des The number of AF points never seemed much of a selling point to me. I've almost always used centre spot AF and re-composed. Wouldn't using a corner spot for focusing require some mental gymnastics, or does it come easily after a while?
I think it's easier, overall. You should be deliberate with your composition, and most of the time you have no business pressing that shutter if you don't know what (or who) you're focusing on.
For action photos it can be tricky, because you may need to change your selected focus point from time to time. Often I'm able to pick a corner that will work (compositionally) in both portrait and landscape camera orientations, without having to select an new AF point.
If using center-point AF, the alternative is to way-overshoot the borders (using a much wider angle than needed) and then crop later. But it's more difficult to get the same "look" that a telephoto lens would give you. Re-composing can introduce focusing errors, and if your subject is static it's actually easier to just move the AF point on the camera.
To directly answer your question, changing the AF point becomes relatively easy after you get used to doing it. More AF points is definitely better, and they should spread out relatively far from the center of the frame.