Your eyesight was probably better in those days, plus the comparatively large focus rings on latter-day manual focus 35mm SLRs were nicely dampened, smooth to operate and easy to use, unlike the comparatively narrow (and often slightly jerky on consumer lenses) focus rings on auto focus SLR lenses, which I think are probably only there to provide the option of occasional fine adjustment, rather than as a secondary means of 'full time' focusing. If I had to focus manually then I know which of the two would be more likely to give me good results.