For a lower voltage drop one could use Schottky diodes, but what are the disadvantages of Schottky's?
They cost more, have higher reverse leakage current, and are physically larger according to a quick search.    Of course they're much faster though :)

Looks like in a same size comparison they can't dissipate as much power as a typical power diode.  Also with larger currents you lose that Vfw advantage.   Oh and wiki says they normally have lower reverse voltage rating on the order of 50V.