I've been around a bit, I could buy AIS and E lenses new back then.
AF lens came along - "plastic stuff", exclaimed the diehard Nikon fans. Mostly body only. Almost all lens elements are still glass, except for the pastic molded Aspherical elements.
Along with AFD came the AFG stuff and a lot of truly plastic lenses, with plastic mounts, like your current AFS 18-105VR, 18-55, etc, that started around the time the AFD 28-80 came out.
But there really is no truth that AFD is plastic and AF less plastic. What changed was the quality of the plastics, at least the external appearance, and if it became more resistant to going "shinny". Bodies of AF lenses go shinny after some use, most AFD lenses remain matt.
In fact, IMHO some of the plastic quality got better, esp with the higher end lenses, like the AFD 85/1.4.
The same lens (like AF28 vs AFD28) the quality of the plastics on the body is IMHO not different.
There is talk that the AFD28 has a revised formula. I don't know if this is true. I had the AF28/2.8, I literally threw it away. It was the worst Nikon lens I had ever used. Even the AFS18-55 is better optically.
One final comment - yes it is true that the only thing that matters practically is the loss of 3D matrix metering on AF lens vs AFD. But there are other considerations, like the age of the lens, AF lenses tend to be quite old, and may no longer have replacement parts.
Having said that, I have 85/1.8, 35/2 nonD lens still in active use and they are still very good.