Only 3 of my interviews are MD/PhD so far, and I havent been to any of them yet Scooby.
The ones I'm referring to are the Texas schools. Since they stop interviewing in December, generally they have quite a few applicants on each interview day.
UTSA had about 100 (maybe slightly less) and UTMB had about 60 when I was there.
I'm sure the AMCAS schools have fewer, since their interview schedules are drawn out over a longer time span.