If the questions/scenarios at each station are carefully and thoughtfully developed, then, perhaps, they can serve as a way to "really get to know an applicant". Otherwise, I think the longer the conversation, the better an interviewer will know an applicant. You can probably BS yourself out of a question or two with each of the 7 interviewers, but it's pretty hard to BS out of 10+ questions with one interviewer.
FWIW, I've never had an interviewer say "so tell me about your research", and all of my interviews thus far have been extremely enjoyable--the highlight of each interview day. I'm guardedly optimistic that that will be same for RWJ.