A good visual lookout doctrine is assumed in all of the situations discussed above and should be your first line of defense (it is mine anyway). Procedural control, radar control, radar advisories, whatever - just keep your head on a swivel.
I don't buy your contention that FSS is useless in this case MTV. Supervisor testimony or not, FSS can't help you if you don't at least try to pull information from them. FSS won't be able to tell you where the flight is on the route, but they can tell you that a flight checked onto the route at time X. That information alone should tell you that there are higher odds than usual that you might see some traffic. In numerous instances I've checked onto a route and had FSS advise me that another flight had checked on some time earlier.
