To the OP: It was weird because I didn't get nervous on any of my interviews except Harvard and Duke. Harvard's NP interviews were nothing to sweat. One interviewer really pressed me to answer questions without taking a middle of the road position (research v. clinical career--no combining), but he wasn't overly aggressive. He offered his insight since he faced a similar dilemma. Anyways, HST was another story all together. At lunch (like 30 minutes before the interviews!) the HST students were like, "yeah I would definitely know all about labs across the nation that are studying similar things and try to reference them. They really like that." I'm sure they would, but its 30 minutes beforehand! Its not like I could rush to PubMed to update myself--so I got more nervous. They were pretty detailed in their interviews and I was nervous to begin with.
As far as the perks of Harvard, they paid for cab vouchers which covered my cab to the hotel that night. That was nice and different than other schools, but they didn't have much structure to their day. They just told us to go wonder or follow their self-guided tour (in the brouchere they gave). I would have rathered larger interview groups with tours leaving every hour or something (like Baylor). I went in like every building, but it wasn't that meaningful for me, since I didn't know what I was looking at (here's a really nice hospital, here's another, here's another, etc.).
Anyways, its a great school, but not without both pros and cons, just like every other. I probably would have done better to recognize that ahead of time.