I was hand-drawing cross-hatched style maps on graph paper in the early 90s when I was a teenager running my own campaigns, and I certainly don't claim to have invented it either..
Yeah, this was kind of my mindset, too. Hatching is certainly an old trick, and I see the "Dyson hatch" is somewhat distinctive - but for me, knowing "old school" maps, it didn't stand out from the other offered styles - and certainly lived up to the promise of "old school" look and feel :)