I hate to generalize, too, so I will just give my specific experiences....
Fred Couples - Never met the man. Owner didn't care if he made site visits or even made the grand opening. Thought his name was magic. Memorable line - He did a course with Paul Cowley, and on his site visit, was reported to call Paul's greens "ballsy."
Larry Nelson - Actually took some routings to his house to review, but really only had a few meetings and three site visits, normally more given over to press. In those meetings, I did get a sense of what he wanted out of the feature design. Memorable line - "I don't putt very well, so put lots of contours in so no one else can either....." On two projects, he actually had laid out a few routings when I got to his house, but neither was particularly good for reasons too long too type. After a bit of discussion, he seemed to realize he was better off leaving that to me.
Lanny Wadkins - 3 Site visits, some feature suggestions, general advice to not make it too hard. Memorable line - (after being warned the site was rocky....) "Never seen so many effin rocks in all my life."
Steve Elkington - Friend of owner, came by twice as favors, and attended grand opening. No routing input, got a general sense of what he liked in feature design, but no specific ideas, other than approval of this or that, and changing a few things. Liked our driveable par 4, had us flash the back of the green up to see at least part of the green, which I liked, too. Too classy to have a memorable line, but did offer to buy my second year Ping putter. PS- with handicap and a partner, did win $5 off him!
Jim Colbert - Most involved, walked routings for most courses, including Colbert Hills, made a few changes. Did like "4 points of the compass" on par 3 and 5. Learned more from him on feature design than anyone, like how players liked to use the wind, etc. to shape shots. I did sit with him multiple times on feature design. Also made several site visits on most courses. Memorable line - (after seeing a mound in the middle of a green) "Jeff, you must be the best damn golfer in the world!" Also had a lot of input on his muni remodels and had an eye for making them practical. I will say from time to time, he and I would see a hole completely differently.
Notah Begay III - Very intelligent and articulate on golf design. Mimicked Colbert on most playability ideas. Actually, so did Elk and Wadkins but it was harder to get that out of them. Like Elk, very proper and not one to make bombastic statements, very thoughtful, but still, I had to translate into something after he left. After the project, he said he would have liked the bunkers to be more like CC, and he thought Fazio was a master at contouring greens. Had a memorable day at Dallas National with he and Trevino listening to a lot of neat architecture theory (not all of which I agreed with)
Tom Watson - I did just a little work with him on a China project. While he didn't draw any plans, other than some hole sketches, he did show me he had a keen grasp of grading and drainage principles, just no time to do it himself.
All in all, I architected, and they were basically occasional "editors". None could really route, grade and drain, etc., so I wouldn't consider them architects. Even when they have features input, it is sometimes a crap shoot from an architects perspective. And, sometimes, they recall very clearly what they thought they were looking for if I had made a decision to change it. But, it was fun and a good general learning experience that made me better.