Surprisingly, at 6' 2", I'm more comfortable in my Miata than my Crossfire, and that's even with the Miata's top up. But I think you're correct Rob, it's probably the high door sills, and "gun site" side glass of the Crossfire that gives my friend the feeling of being in a WW II "pill box".
What's truly ironic though, when we were younger men, he always thought it would have been cool to have been a Military Tank driver. So go figure.