I think Birnbaum's made note that most people go right upon entering the Magic Kingdom; it's simply the way most people are programmed mentally. For me, circling the park clockwise makes the most sense, moving from the primitive world of Adventureland to the futuristic world of Tomorrowland is a natural progression. One can't really do that anymore with virtual queues and lightning lanes, but it's how I experienced the parks pre-Covid.