Tiger Himself noted in one of his interviews this week that the balls have gotten longer and straighter in the past six years. And that the landing areas for driver have become more narrow. So as usual he is being smart--hitting a lot of two irons off the tee because he can hit it 270, and then having confidence that he can hit the green from further out.
Aside from his talent and remarkable concentration, one reason he can be confident that he will hit greens from further back is that the ball is longer and straighter.
For Mr. Doak: How do you think Tiger would play your course at Bandon? I imagine he would hit even more irons off the tee. However, Bandon was designed for this. Do you, Mr. Doak, think there is a difference between courses originally designed to present an iron off the tee as an option, and one that has evolved to that status because of equipment changes?