I owned a `71 Sedan Deville briefly. It was so large outside it had its own zip code. You could land aircraft on its hood. Cars don't get much larger than that. It was a neat car but has nothing on comfort compared to my car.
The seats in my car are supportive and extremely comfortable, the front seat goes so far back that its actually a bit too far for my legs all the way back, and even so I can sit behind myself and my knees are nowhere near the back of the front seat. Sure a bench seat lets you move around (especially when the road starts to bend, whether you want to or not), but truly good seats won't make you uncomfortable if you sit in the same position. The pedals are right where they should be, the steering is well weighted and has feedback. Sure there's a certain novelty to overboosted steering so light you can turn it with your pinky, but on a curvy road I want something quick, precise, well weighted, and has feedback. In fact the only thing that would make it better would be if the steering wheel telescoped so could bring it a bit closer to me and had infinite tilt adjustments VS the 5 or so stepped ones.
Hell, I remember that `76 (IIRC) LeSabre I looked after for a bit before FlyBrian bought it. Despite its massive size The seats couldn't go far back enough for me to be comfortable.
I can get plenty comfortable in a smaller car, the difference is the people in back suffer VS in my Intrepid or say a Charger. But then I don't normally haul more than myself and a passenger, so I wouldn't need to be concerned about size. If I need to haul, more people around I already have a big car. That's how I look at it.