My current DM has his own campaign setting (which he has worked on for the last 15 years or so, adapting it to AD&D 2nd ed, 3.5 and now 4th edition) where none of the typical fantasy races exist (including humans)
Out of respect for his work, I wont go into any more detail (he dreams of publishing it someday), however I wanted to point out that while playing in his world, I sometimes miss humans as "the baseline" from which the rest of the races are described...
Also, in regular games, I tend to play human characters (usually "simple guys", salt-of-the-earth)