I visited Indiana U and U of Illinois. I just e-mailed the departments to set up a visit, but it was really just meeting a couple profs and some current students. Not really a formal interview kind of thing. I was in the area because my sister goes to IU (she's in a PhD program) and I went to visit her.
So, I'm applying to some of the same schools you are, but I only applied to 6 programs: Indiana (applying for Ling and French Ling departments), Illinois, Michigan, Pitt, and UPenn. Apart from my e-mail correspondence with potential advisors, I haven't heard a peep!