Even with those concerns, I still like tolls

A. Driving a car has externalities that are currently not priced in the gas tax / registration fees. This means that having toll free roads are also regressive in that they are forcing people who do not drive (often due to poverty) to subsidize those who do drive. It makes sense to make the drivers pay for more of the harm they cause others, and tolls are a simple way of doing this. They are also can help discourage driving since paying every time you drive in a certain area is probably more noticable than paying once a year when you register your car.

B. This is a real issue in 205 where there is another bridge right next to it. Maybe in this case, you can add a toll to both bridges. But generally, the urban growth boundaries in Oregon make it easy to find places to find put toll booths where there is no way to drive around it.