Jack Fleck used to memorize every feature of a hole's landscape, something he learned from Ben Hogan. Unlike Hogan, Fleck would also pace off his own yardages and compile notebooks for the courses he played, or so says James Dodson in his Hogan book.
We wouldn't care much about knowing yardage if we were playing on courses where the ground and the greens were firm, the wind had a tendency to blow, many of the green sites were approachable via the ground as well as the air, and our 'sets' were still made up of 10 or so clubs that only had spoon, cleek, mashie, mid-mashie, niblick, etc. stamped on their soles instead of a number...
...but we don't.