What I think is cool about drillium, and what makes it cooler than pantographing (to me anyway), is that it wasn't just about saving weight, it was about customizing your bike. This was true at least in the early 70's as local racers took their inspiration from the bikes of Eddy in particular. Kind of like the hot-rod car culture, it was a whole sub-cultural phenomenon. This was true of a lot of the way bikes were detailed out, but drillium was particularly visually obvious, and could be conveniently justified in weight-saving terms. I always think it's funny when someone tries to exactly reproduce a catalog bike from that era, when the first thing a lot of guys would do was modify the bike so that it didn't look like the ones in the catalog. There were a few people who discovered themselves as artists in this medium:

http://www.velo-retro.com/peterjohnson.html

Sure it went to extremes, but what form of fashion of the time didn't? It could be done artlessly or exquisitely. The point was that your bike expressed your personal sense of cool and fast, or that of your locality. Then drillium gave way to titanium as the new cool, Campagnolo's SR group did away with much of drillium's "canvas," and the spun-sugar style faded. Personally, I'm not that interested in drillium that isn't period, but that's just me.