I have a friend who will not drive across bridges. It just freaks her out. I don't mind it. I think driving across a high bridge is fascinating because you can see so much.
I've driven across the Jekyll Island suspension bridge in Georgia and it was incredible. The views were amazing and you could see so many different ships out in the water.
Bridges don't bother me in the least. Tunnels are another story. I can drive through them, but I don't like to. The I-10 tunnels in Mobile, Alabama under the Mobile River are the worst. I drove through the Eisenhower Tunnels in Colorado with less apprehension.