Maybe it's just me, but I never did like the change to metal all that much. I have both plastic and metal laptops now and still dislike metal. Typing on a plasticky HP right now with certainly a better keyboard than the MacBook, but let's not get started with that...

Edit ： I was using for a while both the PowerBook G3 and the PowerBook G4, and much as I tried, I hated the latter as much as I loved the former, and the G3 outlived the G4 by a couple of years.