Love my CZ’s too. The CZ75B is probably the nicest 9mm gun I have ever shot. For .45, I love the 1911 (specifically, Kimber), but for 9mm, everyone should try out the CZ75B IMO.
And I don’t understand the infatuation with plastic guns either!
Weight. Materials change, I prefer polymer sheaths and handles for my knives, fleece to wool, rip stop nylon to canvas and I don't care for leather belts compared to a good multi purpose nylon belt.
I like all of these modern materials and I was stoked in the early 1980s when they came out with a full sized Glock 17 combat pistol that with a holster and 17 rounds weighed a fraction under two pounds, to me that is a huge break through towards a better future.