At both the MK and DL I go left- go on Splash, Big Thunder, Pirates, Jungle Cruise (And when at DL I go on Indy & HM too). We usually go to the MK two mornings so on the second morning we head straight thru the castle and go on Dumbo first with the kidlets, then Peter Pan, Pooh, Carousel, etc. I don't think I ever go right! Buzz never seemed to have too terrible of a line, and we always FP Space Mountain. I am right handed too!
Good question!!!