Some people care about a bike weighing a full water bottle or two more or less.

There's an emerging trend in steel bikes -- one way goes for lugs, and steel forks. They tend to weigh more -- maybe 18-20 pounds. Mine is about 20-21, but that's with cages and a heavier saddle than is on there now, and it's a big bike. Oh, and yes, the steel fork is heavier than carbon. But it's also prettier, and rides very nicely. Photo below.

The other trend is for double-overized tubing, filet brazed, with carbon forks, seat post, etc. Lighter -- by 2-3 pounds. Competitive with carbon / epoxy bikes for weight? Maybe.

Most folks who ride steel either grew up riding it, or chose it because of the way it feels. I've ridden alu and carbon (and only a brief time on Ti). I rode a very nice S-works Roubaix, and yes it was lighter, and went up hills 4% faster. But it also felt distinctly meh.