I started CG about a month ago, have been exclusively co-washing for 3 weeks, and I have definitely noticed lots of hair in the shower drain on wash days. It's not excessive, but it's more than I'm used to seeing. I attribute it to more of the fingertip scrubbing of my scalp loosening the hairs that are ready to come out anyway so I'm not worried about it.
I think the difference is I never really paid that much attention to scrubbing my scalp before co-washing, and now I am.
My hair is SO much healthier and happier on CG and with co-washing, and I have TONS of hair anyway. Plus don't forget it's normal to lose 100 hairs or so a day anyway, and I don't think losing the hair really has anything to do with the length.
CG since September 2011
Porosity: normal to low
Style: MOP Curl Defining Cream, Angel, Garnier Pure Clean Gel
SOTC: MOP Glisten pomade, Aveda Humectant Pomade
Looking for: good curl definition, clumping and no frizz