It's important to note that these are not 30+ yard pass plays but rather only plays in which the ball was in the air for 30 or more yards. Here are the yardage results on these plays as well as the number of 30+ yard pass completions for each QB:
Rivers' efficiency in throwing the deep ball is unparalleled; in fact, McNabb and Romo were the only QBs who had more 30+ yard completions than Rivers had 40+ yard completions (7). It certainly helps to have a pair of 6'5" receivers who can go up and pull down the pass but you still have to be accurate enough to put the receiver in such a position. Much was made of Rivers' funky throwing motion when coming out of NC State, but none of that should matter for any QB as long as he can put the ball where it needs to be.