For years, in using my Canon DSLRs, I've always turned off the gazillion focusing squares and elected for just one in the center. I suppose if photographing a moving subject, moving either toward or away from the camera would be a perfect time to have the gazillion squares turned on. For me, I prefer to have just one focusing square and have total control. Am I missing something? Or, do many of you turn off all but one of the focusing squares?
I use centered single point focus most often in single shot mode. For slow moving objects I use continuous mode and move the square to fit the composition. For fast moving sports I use multi-point continuous since it’s too hard to hold a single square on a moving face or body. It will miss focus maybe 20% of the time but still yields the best results for me.