Carrying on from "Why does flying IFR require a rating?" How can a non-IFR rated pilot file and fly SVFR without visual contact with the horizon?

For the U.S., Wikipedia says 1 mile visibility is the limit. Isn't that too low even in daylight?

Having only the surface in-sight, be it a calm lake or urban area, without seeing the horizon, must be a huge workload for a VFR pilot.