My Nikkor 50mm f/1.4 AI-S was a favourite for many years and was one of my first manual focus lenses and the dampened, but not stiff, focus ring was a nice change from my plastic AF-S lenses. The major benifit at the time with the level of dampening was it helped with precise/limited movement for focusing at wide open apertures.
However with regreasing a number of other Nikkors I've started to prefer a softer focus feel - these are my notes for how to regrease/lubricate a Nikkor 50mm f/1.4 AI-S.