Some places still use salt, but people find it less delicious these days than it used to be, so they are using some form of chemical deicer. Who knows what that's doing to our vehicles.
My mailbox has some rust spots on it, but it's probably as old as the house which was built well before I was born. The neighbor always manages to get rust on his trucks after a few years... not sure how he's doing it as other vehicles on the block do not rust even though they are older.