> I think there must be more vertical room so you can sit in a more chair like position.
I'm tall. Yes, you sit more upright. There is more headroom sometimes. Nicer trucks mostly have a moonroof installed, which chops 1.5" out of the headroom. Where the seat is located relative to the rollover support (where the seatbelt is attached on the side) is important. A lot of trucks have this too far forward, so a tall person is shouldered up against it.
For the most part, though, the seating and instrumentation are all built for the same size people as cars. Before my current truck, I drove a saturn and then a prius. Probably the width of the truck is more helpful than any height.
The big benefit for me with regard to height is that I step up into the truck, rather than have to slide down into the car. Especially on those days when my back isn't feeling so great.