I am reminded of the Henry Ford quote "If I had asked people what they wanted, they would have said faster horses."

The design idioms seen in Gnome 2 and Windows 7 are essentially highly refined versions of what existed on the Apple II OS. Personal computers and what we use them for have come a long way since then and it makes sense to redesign the UI to reflect this. Often this means getting your hands dirty and trying new things. Also - first time users are going to be around for longer than experienced users ;)