TEPaul,
I imagine Pat Mucci can tell us the best, but I would put what you are referring to more in the Ed Furgol category as opposed to Hinkle. I was under the impression that Hinkle was cutting off serious yardage and that is what produced the tree. I have my doubts that a tree would appear at Oakmont to stop better angle seekers.
Glenn,
# 8 at Inverness was a crescent shaped (long dogleg left) par 5 with some features, including a crossing brook and dropped terrain, that made it appealing to play down the other fairway, straight toward the green, gaining valueable distance and perhaps a better angle into the green, although, the approach to the green from the other hole was impeded by a large stand of trees.
While getting over that stand might present a difficult shot for most of us, for a PGA Tour Pro I don't think it was all that difficult.
I believe that there was OB running along the entire right side of the hole, thus play to the fairway to the left of # 8 took all of that out of play.
With the large galleries that attend U.S. Opens, unless you provide them with flak jackets and helmets, I don't think players should be encouraged to play to other holes.