Drum brakes have their benefits, namely they help (slightly) with fuel economy since when their not applied (and are adjusted correctly) there is no drag from the brake shoes whereas disc brakes are always (slightly) in contact with the brake rotor so there is always some drag (granted not much).
I'll give a prime example of what I've experinced first-hand: I own two air-cooled VW's. A '67 and a '60. Both are almost identical (though the '60 is a little lighter, but not by too much). The '67 has disc/drums from the factory and stops and drives very well. The '60 has drum/drum at all four corners (all stock, save for the hard brake lines that I made). When driving, the '67 stops better, though it's hard to tell. When coasting (or flat-towing) the '60 tows easier and the difference in brake drag is very dramatic. When I built the '60 I almost installed four-wheel discs but I'm glad that I stuck with the drums on that car. A friend once drove both cars and couldn't tell a difference in the brakes, which tells me the drums work pretty good.
All that being said, I prefer disc brakes. their easier (and cheaper) to maintain and repair and I think for 'enthusiastic' driving their better (less worry about brake fade). In ten years I doubt any new cars or trucks come equipped with drum brakes, even my super-heavy (and heavy duty) '11 F-450 has four-wheel discs.
Kevin