Pat, I attended every day but one of the 1965 U.S. Open at Bellerive, including practice rounds and playoff. The course was five years old, eight years younger than I was at the time.
There were not so many trees. e.g. my memory is that the only thing separating one and ten was rough and a trap or two. Same with the lower holes on the front nine. Pretty wide open as far as trees were concerned. Maybe there were some saplings, but I recall nothing like I see on google maps now.
Even when I was 13 years old, the course disappointed me. The holes did not seem to have much character, or uniqueness, or interest. Actually, a number of holes on the old Forest Park 18 hole course interested me more. I only saw Bellerive from the gallery then, though when I played it five years later (snuck on during caddy day) I had the same reaction.
What a difference the first time I saw Westwood, another St. Louis country club, a year later. An excellent old classic course, it blew me away. I knew nothing about golf course architecture, but I sure knew what I liked.
Then a few years after the 1965 U.S. Open, I caddied one day at Old Warson. They needed extra caddies for a tournament there, and recruited some of us from SLCC. Warson is another RTJ design, that had a big reputation in St. Louis back then. I was really excited to go see the course. But I had the same reaction at OW as at Bellerive.
Only two samples of RTJ architecture. But two with good to excellent reputations, that held majors and/or big golf tournaments. Both left me pretty flat. It totally mystifies me that Bellerive is rated among the top 100 U.S. courses.
BTW, I thought the dark ages started right after WWII, ushered in by RTJ, and ran into the 1970's or so.