GeoffreyC:
Regarding #18, you are both right and wrong. The hole was changed, but quite a long time ago (circa 1950's, I believe).
The new 18th is the mid length shot over the pond you mentioned. But, the parking lot is directly between it, no more than one club's worth.
So, it was tough as a little kid. You were afraid of not clearing the pond, but equally worried about breaking someone's windshield. Keep in mind that we didn't have a big supply of golf balls, so it was quite a dilemma!
Of late, I think there are more bushes which obscure the cars, but nothing else has changed about the area around the green. Last fall, however, it looked like they were re-building and lengthening the tee maybe 5-10 yards.
I also noticed a few other changes. The sequence of the holes on the back nine has changed, something nobody in the pro shop had been around long enough to even know. Also, the development around holes #4 and #5 has changed their visual appearance.
Finally, Stephen Kay did some consulting work their a few years back. The only major change I saw ws the green complex on #7. He added contour to what was a fairly flat green and built some mounds to make the green partially blind.
I'm glad you mentioned the par 5 #3 because I share your liking for that hole (whose green sits right below where Jack Whitaker used to live).
The ninth is indeed a tough driving hole. I'd say both left and right are bad. You really need to be straight.
As for #4, I believe it is a text book example to illustrate the difference between relative and absolute length. The club built a new back tee to preserve the challenge I enjoyed so much 35 years ago. But, is it what a guy like Ron Whitten calls "progress"? Not in my book.