Make that 3 guys (including me) now. Here's the whole story:
Today, I went and checked out the game that was NOT the 3 screen motorized seat set up (meaning, a regular kiosk w controller). In that set up, the camera change button is the standard right bumper as explained in the load screen. In the wheels/3 screen set up, they had to remap the buttons so searching for the right bumper would not have mattered (It's X button if you care). So basically, no one ever changed the camera from the cockpit view when they played one of those awesome 3 screen set ups (and why would you? the whole set up was to emulate the in car experience). But with the regular kiosk, it's easy to figure out how to change the camera and everybody does it.
On Tuesday, I played nothing but the wheel/3 screen set up (because it's so damn cool, obviously), so I just took in whatever the framerate I saw as 60 that was reported (yes, my internal frame rate counter is obviously not well calibrated).
Today, I tried out the regular kiosk. And when you change the camera away from the cockpit view, it's VERY easy to see that it's running less smoothly than the other views! I don't know if the cockpit view is running 30, 40, or 45 fps, but it's definitely less than whatever the other views are (probably 60, which I can't say for sure since my internal frame rate detector seems to suck). VERY easy to see the difference cycling through the views.
So I talked to one of the devs manning the kiosks. Here's the deal: The cockpit view was implemented last, and it employs a different lighting model than the other views. Thus it needs way more optimizing than the other views. Dan was there, so I cornered him on this. He says wait until final code. They will get there (FYI, the E3 demo code is about a month old).
So that's the whole story. Whoever that guy was in this thread was right on. Props to him and my apologies for doubting him.