I'm sorry you have so much traffic. You must have some nice bike paths to ride if you're in the city. With money comes infrastructure. There's virtually no infrastructure here for bikes. I guess I'm blessed here to have little or no traffic but I like seeing other people out cycling and running but it's very rare to see where I ride. But my roads are pretty much straight with not a lot of scenery. I have to ride 18 miles to get into the hills and the curves. I don't mind the straight roads too much and the grid allows me multiple options for loops. I hate riding out and then coming back the same way.
Yep the larger the tire the less pressure they take. I often run my fatbike at 5 or 6 pounds. 10 is usual though. Gives me the best of both worlds. Soft enough that I don't feel the cracks and ruts but hard enough that it doesn't slow me down too much. I like to ride in sandy desert washes and that requires a low pressure.
I bet half the dogs I encounter are pit bulls. They scare me. They always get the hot sauce if they come near me. I was driving down a road near my house and 4 of them came out and tried to attack my tires. They chased my car for half a mile. I thought wow, what if I had been on my bike. But the bear spray works 100% of the time. It is better than mace because you can just give a little puff and the dogs run into it instead of spraying them full force in the face like the have to do with those little cans of mace.