I've seen some of these programs - can't remember which - plot nonsensical shapes
Thats certainly true, but they do a much better job than my hand efforts which contain my errors as well as any in the source material.
It seems some pilots just ignore these geographic exercise warnings, and it's true that the controlling military authority sometimes say "what exercise?" when asked about traffic on the radio, but I find Ian Fallon's program invaluable in alerting me to the potential for conflicts in the open FIR.
(One of these notams once advertised a 'US carrier battle group with intensive flying operations' right along my track in the Western Approaches. Excited, I made sure the camera was primed. "What aircraft carrier?" St Mawgan said. "But it's in the notams!" I protested. "Oh" they said, disinterested. "We don't have any reports of that". Turned out the yanks had cancelled their courtesy call in Dublin for some reason).