Dale and George,
I think we hashed through this is last week's GPS thread but what the heck...
No, I can not hit one shot 135 yards and the next one 140 yards and count on them ending up 5 yards apart. But yes, I may indeed make a different swing if I know it's 135 versus 140. Or maybe not, it depends on what the target is and whether it's between clubs or not.
When I'm hitting the ball decently I can hit a 6-iron pretty comfortably 135 yards but I'll bet I wouldn't make it 140 more than one time in ten, if that. So for a 140-yard shot I'd use a 5-iron virtually every time no matter what (and I might still come up short if I make a bad swing). But if it's 135 to the hole and, let's say, 142 to the rough over the green I'd be foolish to hit that 5-iron, wouldn't I?
The point being, there's some distance at which a certain club ceases to be the smart one to hit and the next longer club is the right play. Not every shot matters. If the hole is dead center of a 10,000 square foot green I care not whether the exact distance is 132 or 134 or 136, I'm going to hit a plain old 6-iron shot. If you have a decision between clubs, surely the odds are in your favor if you make that decision based on correct information.
For me, it really only matters when there's some boundary between "safe" and "trouble" that happens to be near the hole. If the hole is six paces from the front of the green and there's water short of the green then I'm much more attentive to getting it past the hole than if short of the green was just closely-mown fringe.