Generally, I portray human characters.  However, I tend to think of a humanocentric campaign as one where humans matter.   I think all character races can be given a chance to shine, but many settings seem to have humanity as the dominant humanoid species.  (Perhaps we will begin seeing more of a "voice in a chorus" approach where humans are an important species, but that several of the other nonhuman species are important as well.  In science fiction, Babylon 5 did a very good job of this, as humanity had a big role to play, helping different races to find common cause and work with each other.)