Actually I'd say any fighter pilot could drive a lap easily, but I doubt many of the drivers could jump into the cockpit and fly a fighter jet round a simply circuit of an airfield.
They would hardly be setting competitive lap times though, would they?
Anyway, I like to see drivers actually having to
drive the car. And in that regard I prefer the 2015 (or 1997) cars to, for example, the 2011 Red Bull which was pretty much on rails through the corners. Being on rails is faster and probably more physically challenging (at least when you're doing it for close to two hours) but it's not really about driving, is it? So I'm not sure the right thing to do is to add more downforce. I'd say bring in better tyres that allow more speed to be carried through corners and more power to be applied out of them. And if the drivers want a physical challenge, then start by banning power steering, which I think would make
driving the cars a little more challenging as well.