I love the bunker/turret feel of the JK interior! I've always hated the fish bowl feeling of vehicles with really open and airy interiors. Each to their own
In saying that I don't find visibility too much of an issue in the JK. I do get what you mean, but it doesn't bother me, I've never thought "geez I wish that A pillar was thinner" or "I wish the roof line was higher". The only time would be maybe when I am offroading up a steep hill and approach the top and you are wondering what on the other side, I feel the JK doesn't let me see what's on the other side for a bit longer compared to prev vehicles with a more sloping bonnet. But no big deal.
But I also have a 52" light bar accross the top of my windscreen which sits flush with the top of the roofline (not above it like a lot of brackets mount them), which means it eats into the top of my windscreen a lot. Plus I have a bonnet mounted light bar as well which eats into visibility a little when looking down the bonnet.