I'd bet dollars to donuts that if the courses they played were still the length of the ones in 1980 that those GIR numbers would be a lot better. As well the scoring averages would be waaayyyyy better!
Exactly Kalen,
All of that new ball & driver technology has resulted in the same GIR & only slight scoring average reduction. But at what cost? Adding yardage to golf courses (thus also increasing the cost of golf course maintenance due to additional acreage needed). Also, boring boring golf - Big drive with short iron to wedge from fairway, or shot from very long rough that will mostly be aerial to green. No run-ups, no bounce-ins, no cuts/draws, no punch-shots.
The response is usually, longer drives by pros are more fun to watch, and longer drives & better mis-hits by the casual golfers makes the game more enjoyable for the consumer. Yet when the super stars are absent (the public always enjoys seeing the masters of the trade), attendance & ratings are dismal. And most casual golfers will spend more time talking about the most creative shot they pulled off (the punch shot from under the trees or the bounce-in with the utility club), rather than the off-center shot that still went 220 or 250 and stayed in play.
What are the most talked about shots by Tiger --- his recovery shots. The great chips (Masters 16th hole), his long-irons from off the fairway (2008 US Open), his stingers from the tee, etc.
So while technology has resulted in more expensive drivers, more expensive balls, and more expensive green fees; the end result for us is minimal changes in scoring & stats for the pros, but a more boring type of golf to watch and play.