My interview was very laid back. We sat in the main lobby of the place on some benches and shot the breeze for 45 minutes or so. As a non-traditional candidate, he was most interested in why I was changing careers into Dentistry and why I was interested in UMDNJ. I didn't get any of those canned questions such as "Can you describe a situation in which you have been ethically tested?". He was more interested in my military service and life experience. And from the acceptance phone call, it was the 10 years between undergrad and the interview that got me in I think.
My DAT scores were 24TS, 23AA, 20 PAT, so I'm sure those helped get me in the door too.
Hope that helps! As an aside, I have not been to any stressful interviews. They all seem to be conversational and relaxed. Try and be relaxed and they should go fine. Just do your research on each school prior to the interview and be ready to ask specific questions about their programs.
As some advice, I would apply to more than just UMDNJ. You may not want to move your family, but you could probably commute to NYU and Columbia as well. 3 chances to get in are better than 1 chance.