I'm sorry if I offended you, I don't mean to. New York City is an interesting place to live. I lived there twice, so I know it well. If cost were not an issue, I still likely would not have gone to Columbia; however, it is a major issue, so that's a moot point.
The only thing I would strongly disagree with is your argument that a great medical program makes a great dental program. An understanding of medicine is certainly interesting and I don't mean to downplay it. Nonetheless, you are not going to be a medical doctor, you are going to be a dentist. Dentistry is about clinical, pure and simple. You may be able to "handle" it- the overwhelming majority of people in dental school can. Yet, without the training, you will not be able to practice.
Anyway, I'm done debating Columbia with you. Congratulations on getting in. I hope you are right that it is the place for you and you have a rewarding experience.