I have a friend that I play golf with everyday. Last year he says to me "bro if you could hit 300 yards every time down the middle you would be shooting eight under par (-8) every round." At the time I had shot several nines under par, but had not had a total round under par. Many many full rounds at par or a few strokes over, with many other rounds in the high 70's low 80's.
Over the last year I have had my first hole in one 12/10/2011. I had my first round under par 4/4/2012 (-1) 70. Then on 7/7/2012 I shot my age on nine holes 31 (-5) and that same round shot my best score -5 (67) CR (72.3). I also passed the P.A.T. at Firestone C.C. in October on the first run. (78)(73).
My driving proficiency has improved from a year ago and the above described events have occurred to corroborate his theory.
Although this may seem true, my answer to him at the time was a simple test:
Start 50 yards from the hole on all 18 holes and see how many times you can get the ball in the hole in two. He only got the ball in the hole in two twice on the entire 18.
I think length does play a role in lower scoring, but it is not the determining factor. I think the determining factor is 7'11".
A major stat in golf is that tour pros make more than 50% of their putts from 7'11' and shorter. Anything longer than 7'11" and the percentage drops to less than 50%. So if your approach shots (no matter how long your drive might have been) are outside this number then that drive made little difference in relationship to scoring.
So here is the discussion question: Why do golfers believe that driving the ball longer will drop their scores the fastest? (For proof of this assumption, look at golfers goals for the year thread and add up how many people say their goal is to straighten and lengthen their driver and lower their handicap.)