I just picked up an old Q 200 about a month and a half ago; my first gas grill. I'm usually only cooking for myself and a guest, and initially my concern was that it would be to large for my needs. Figured I'd just use it once in a while to supplement my Smokey Joe, but honestly (embarrassingly?), It's just so convenient now that i hooked it up to a real tank, that I've been using it almost every time I cook.
It's actually about the perfect size grate. Once there's a chunk of foil wrapped hickory on the grill, plus the hobo style foil packet for veggies, the onion slices and mushrooms, burgers and buns etc, it's just about full.
I've also got an old (Ozark trail?) griddle that I'd picked up a couple of years ago from Wally world during a hurricane for use on my Coleman camp stove, and it fits perfectly, with a few inches of grill still exposed and usable at the front of the grates. Overall I wouldn't recommend that particular griddle because there flip side has a "grill pattern" that is literally sharp-it will cut through food as it cooks!
I'd still like to pick up a GGA for portability, and need to get a larger diameter kettle, but I'm not really disappointed in my Q200 at this point and am using it almost daily.