Adam,
If I'm not mistaken, most of those nice Ross drawings are the handiwork of Walter Irving Johnson - Ross' draftsman at Pinehurst.
Tom Simpson's drawing is wonderful. Check out his book, with H.N. Wethered, The Architectural Side of Golf. The book features some very attractive Simpson drawings, that actually make me think of Mike Strantz' stuff. It's somewhat similiar art.
I also enjoy Dr. Mackenzie's "loose" plans. His original routing maps for Alwoodley, Augusta, Ohio State, and others aren't technical, but very attractive nonetheless.
As for modern architects, Don Placek, from Doak's office, has dome some very nice work. I also like some sketches I've seen by Kyle Phillips, Ron Prichard, and Gil Hanse - who's style seems to be an interesting cross between Johnson and Flynn.
Perhaps the best though, based on his work in Paul Daley's Favourite Holes by Design and those wonderful sketches of each hole at Barnbougle Dunes, is Michael Cocking of Australia.
In fact, Daley's aforementioned book presents an interesting study of the drafting/sketching work of many contemporary architects throughout the world.