[badsectoracula]

I'm pretty sure 60% of the reason is that it has a cool name :-P. The rest 40% is that at least the part you can easily see, like the comparison between arbitrary spaghetti flowcharts and much more tidy looking DRAKON flowcharts, do look convincing enough. Since 2-3 years now there is even a web-based editor you can play around with, which adds to its shareability.

Of course its mystique association with the USSR space program also helps despite supposedly all being classified (which, if anything, adds to the mystique), but IMO even without those, the cool name would do enough to be shared :-P.