I applied to 16 schools. I think only one school so far (Nova) has asked what other schools I have applied to. So unless they specifically ask I'm not sure they will even know where else you applied.
app'd to 30+ schools. I didn't tell them all the schools. If adcom have too much time on their hands to look at how many schools I applied to, and ask me during interview, I'll just tell em I added those schools after I submitted the secondary.