I have a very old Weber Genesis, (made in USA, amazingly) and it still cooks very well. I replaced the grates and flavorizer bars and it truly does feel like a new grill just like yours. I also had to replace the gas regulator as the old style is no longer made for newer tanks.
Yeah, a couple of years ago I got new grates, new knobs and new flavorizer bars for my 10 year old Weber Genesis, which probably cost under $700 back in 2011, and it still feels like a new grill!