I can't see why you cannot use any documented aviation waypoint, including those normally used for IFR, as a VFR waypoint, in a flight plan, or in a route programmed into a GPS, or in ATC comms.
Airways intersections make extremely useful VFR waypoints. They are all over the place, in all sorts of handy places, and when it comes to programming the route into a GPS they are much easier to use and less error prone than creating user waypoints. They are easier to speak than VFR reporting points because they have regular 5-letter names whereas VFR r.p. have silly long names like "Hengisbury Head"!
This may also sound silly but if you are under a radar information service and you say "G-XXXX next waypoint BRIPO" it sounds more like you know where you are going than saying "errr, we are following the coast until we get to Bridgeport"
