Newer GM interiors are an improvement over what they made in the 90's, but that was not hard to do. Newer GM interiors may have better ergonomics than G bodies, but that again is not saying much. The plastics used in G bodies, and the fabrics used in the better ones blow the new cars away. Plus, the switches, etc. are all better made and more robust in the 80's than now.
I will also say that if you want a good benchmark, you need to go to Germany, not the US, Korea, or Japan. VW interiors are much nicer looking than anything in a domestic car. Very nice feeling right up until the time it all falls apart... Ditto Mercedes Benz or BMW vs Cadillac or Lincoln. GM is still stuck in the time of fake wood, and poor stying on it's mainstream cars. They need to modernize things and get out of the 80's. I mean, C'mon...the Cobalt looks like a 1995 Cavalier!