I shot PJ back in the days when zooms were lousy and every serious PJ shot with at least two cameras on his neck and shoulders with different primes on each camera. We "zoomed" by dropping one camera and grabbing the other. Straps, straps, straps.
I always have a strap on my cameras, and every time I pick one up for any reason, I'll loop the strap over my wrist. That even included my Mamiya RZ67 cameras, even though I mostly used them on tripods. When I attach a camera to a tripod, I will have the strap looped over my wrist until the quick-release is firmly attached (and I've checked it).
If I'm going to back up my cameras, why would I not back up my butter fingers?