We used to have a couple of "no icons" events in the past on some snapshots with historical planesets. Although most of the action took place inside on sector, mostly around the Jabo target, it was too tough to be fun.
Another question: How big is a "big" monitor? My 24" widescreen is the biggest I have ever had so far, but I still can't tell a flowerpot fly from a dot without icons. Not to mention, that I have a microfibre cloth within reach to wipe off every dot looking dust particle.
I don't say that this icon system we now have is perfect, but compensates the lack of 3D reality on this 2D surface. And it is quite adjustable too.