Laden freighters sit low in the water so they do not rock and sway as much as a tall, lightly laden passenger liner; if you are subject to motion sickness this is a real plus. It is quite an experience. I sailed this way once from Tampa FL to Germany back in the late 70's. Really enjoyed it.
that's what they did before planes were invented - it's a lot longer trip than by plane and probably just as expensive, since you are paying for a room and meals also
Well, considering that there is a giant body of water between them I don't see why not.
YES daily