This is an old discussion, but one crucial to comfort. Put in 100 accumulated miles on drop bars and you will feel more comfortable with them. Especially if the bars are up near the level of your saddle. Not to impugn flat bars..plenty of people put in plenty of miles with them.
Still, the arm, hand and wrist position seems more "natural" to me, and therefore more relaxed over long miles. Leverage isn't so much an issue on the road except on hard, sharp climbs with a death grip on the hoods or sprinting for your life from that farmer's dog. Much extended climbing is done on the tops or with a relaxed grip on the hoods. With drops, the nice thing is: there are plenty of variations on hand position-- which can relax the arms, hands, wrists, slightly change the angle of the back, the shoulders, etc....and after a few hours those seeming little things help a lot.