Dave,
Do you really think you and I would aim at exactly the same spot from the 13th tee at Augusta. I've never had the priveledge, but I would imagine that pin position (assuming it is known) may well determine whether or not I am even going to consider going after the green in two. With a pin in the back right, near the creek, you have very little chance of getting down in two if you miss the green left of long (or so it appears from my couch) that it would make much more sense to go at that pin from your ideal pitch distance. Therefore, if you are going to lay up anyway, why hit more club than is necessary off the tee?
That hole more than most other par fives gives the player the opportunity to decide before teeing off if they are going to go for (or consider going for) the green with their second, and therefore is very strategic.
Jim