I always wear a strap around my neck, my wife taught me well. Neither of us EVER dropped a camera and we've met many people who have.
Bad excuses heard for people not having cameras: I wear a strap but I loaned it to my spouse who took the strap off. It wasn't that I dropped it, it was this guy who knocked it out of my hand.
Once in awhile now I change, "straps." If I'm going to be out for several hours I switch to a harness. I took a K100D/Tamron 18-200 with Pentax strap on a trip to D.C. and had some upper back ache. A harness from a Birder store solved that. Call it a, "double strap." I may look dorky with the, "Fat Robin" logo on my harness but I'm comfortable.