I'm another right front preference guy because of the ingrained motorcycle thing.
In most situations it doesn't matter, if I have a smidge of time to think about it, but those few emergency situations where I react on instinct and instant front/right instincts just happen.
I figure it was all the motorcycling on street and on track and being a lover of late braking.

I set up my first disc bike this way as well and it works great. My old mountain bike is Scottish so have been riding right front on it for about 15 years. Will switch my other drop bar bike as well when I change the bar tape one of these days.