me four !
but then again it all depends on the line used and the cast's purpose.
comp-style distance: no. exact carry length primes and shooting on the BC can make it haphazard.
fishing distance: yes
saltwater-style quick cast : most definitely
a distance change for say, to quickly get to a farther rise than where i'm currently fishing: yes
shooting the BC into a strong wind can be a no-no...
either way, shooting on the BC usually takes more practice to get it right compared to on the FC.
"I think I probably do it because my back casts tend to have a better loop shape?"
good point Mike. what's for sure is if they look better you're definitely doing it right !
cheers,
marc