It would be nice to have a nationwide transponder. In Massachusetts, we had "Fast Lane" before joining the "E-ZPass" contingent. After a few years the toll booths were removed and now we have gantries along the Mass Pike. There isn't a gantry for every exit - they're over the highway itself - so there are sections that are effectively "free."
I must admit it has made some of the more congested exits much easier to navigate.
It's been a while but in New York there were still sections with the old-fashioned gates that everyone had to stop at, whether or not they had a transponder. You'd have to stop in the tollbooth and then wait for the light to turn green and the gate to come up.