I didn't specifically avoid CSDCAS when deciding to apply to schools, but it was a slight factor in my decision-making. I applied to zero schools on CSDCAS and, while it was a pain to follow six different sets of instructions for six different applications (and sometimes more, because a few schools had grad school AND departmental apps), it really beat the stress that CSDCAS seemed to put on a lot of my peers.
I think if CSDCAS is actually going to be effective and worthwhile, all (or most) of the schools have to use it. And it needs a significant overhaul.