bio has plenty of humans in it... just you wait until Search 4 Better Health, you'll see lotsa humans then.
I don't think the 05ers have discovered the bio forum yet, or if they have, they haven't gelled with the biologists from previous years yet. If you really wanna be keen, try posting in the To Infinity And Beyond!! subforum.
I did Geography (not sure if that counts under your definition) with Bio, and mainly did more people-oriented courses. Some people I knew did all 3 sciences, and english, and 3 or 4 unit maths... For me, that would be overkill, but for them, it was what they wanted to do.
Bio, for me, isn't about interacting with humans or textbooks - it's how life acts and interacts. It includes people, but isn't focussed on them.