I interviewed w/ Baylor in late Nov, and I found it to be totally laidback.
You're supposed to arrive at 10 am, but I recommend arriving about 45 minutes early, because if you are one of the first to arrive, then you are one of the first to leave. At about 10:30 you go upstairs to meet with the dean of admissions, Dr. Jack Long. You meet, talk about the day, blah, blah...then the financial aid people come in and talked for a little while. At about 11:30-11:45 you begin a tour w/ 4th yr. students then go down to the cafeteria for lunch. At 1, you head back upstairs for interviews. They are round robin style and only last about 10-15 min each. You interview w/ two members of admissions committe (usually faculty) and Dr. Long. All interviewees are supposed to interview w/ Dr. Long.
I found it pretty laid back and comfortable. The interviews were very conversational in nature. Sure, you get the usual question, 'why dentistry' but then we also got on tangents about other subjects....then the day ends.
Again, if you're one of the first to arrive, you're one of the first to be done w/ interviews and you get to leave early and don't have to wait around.
Good luck!