Yup, yup, yup, and yup. I just saw it today and thought nearly all the same things.
The body count in Metropolis must be massive. "Weirdly elided" is a good way to put it. With so many skyscrapers crashing down, I couldn't help but think of 9/11 which conjures a very tangible sense of loss of life.
And Superman isn't worried about all the destruction? Metropolis looks like a wasteland by the end.
Jonathan Kent is also too stupid to live clearly. He's worried about Clark's feelings getting hurt when he's a kid but isn't worried about letting his son watch him die when Clark could save him?
I also had the same thoughts about the overpass. Don't any of those people know better? Lie in a ditch if you can and cover your head.