From personal experience I can tell you that today's equipment is much, much easier to use. I am 63 and I hit the ball much farther and straighter than I did 30 years ago. Todays balls fly much, much straighter.
Actually, all I can attest to is the ball technology, since I play with old clubs. I took a break from golf about 10 years ago and was amazed at how straight and far the balls go (at least 10% further). Plus they are so much more durable. The old premium wound balata balls of 40+ years ago were very fragile, plus would curve wildly with the slight miss-hit. When the solid and/or durable balls came around in the 70's they were almost impossible to stop on a green. I guess the only bad things about today's balls is that it is much harder to purposely hit a big slice or hook to get out of trouble...but you are in trouble much less, too.
I plan on getting new clubs this year and then can attest to their worth. But from what I have heard, they really help, too (my clubs are 20+ years old).
Seems like I remember a major change to Colonial in the late 60's, especially to #'s 7, 8 and 13. I remember #13 with a huge chasm to the green, and over 220 yards long. Thank God they left #5 untouched! Plus the Tour started taking over the courses and preparing them easier back in the 70's or 80's...too much much crying from the pros about rough, etc. Of course you can still hear the whining every year at the U. S. Open. At least, for the first time in years, the winds got up this weekend and made Colonial play a lot tougher. Consider the winner was +2 this weekend. Colonial's defenses are based a lot on a good breeze.
Still, I think that all they have to get scores back to normal without screwing with the good courses is make the Tour play with 1960 technology. But, of course it would never happen because the golf industry is built on innovation and weekend golfers would want to play what the pro's play. Or at least keep the technology where it is, especially with the balls, otherwise I will be hitting 300 yard drives when I am 90!