I know the question can be asked a lot,...
I know the question can be asked a lot, but Right Zip means, laying down, its on MY right? This is important cause I'll be using it in a Black Diamond Bivy, which has the tiny right zipper.
As Deon said, you are right.
Being right-handed I find left-zip bags, as do many others, easier to manipulate. Although a little practice will develop the muscle memory needed to negate any real inconvenience of which side the zipper is on.