As a nursing student, you'll probably get a lot more clinical experience than most pre-meds ever get...
This is not only true for premedical students. Such could be extended to students in the first two years of medical school as well. Clinical experience for student doctors is designed to take place after certain specialties may already be impossible for you to match. Nurses learn their requisite skills along side their didactic requirements.
The major that you declare doesn't matter much for medical school, and I have to say that after reading many of these posts, it didn't become much of an issue for my class because I wasn't admitted with anybody with a nursing degree (to my knowledge). I don't think that nurses were discriminated against, though. Instead, I just don't think that we had nurses apply with MCAT/GPA numbers typical of the pool that was eventually accepted. Based on the attitudes of my colleagues, getting a nursing degree would be seemingly beneath them.
In my school, nursing majors take Human Anatomy and Physiology, while pre-med majors take Human Physiology. HAP is much easier and less deep in terms of material and details. They also take a different sort of chemistry, that I've heard is easier than the pre-med chemistry (theirs is only 1 class, 1 lab, while ours is chem1, chem2, chemlab, o-chem1, ochem2, ochem lab). Nursing majors do NOT have to take any organic chemistry here, since they are only here for 2 years before transferring to the nursing campus.
Physiology isn't required for medical school, and I'm sure that the nursing school would take the pre-med sequence in lieu of the lower level courses (though they would know what you're up to). Regarding the med school prerequisites issue, a student could get all of the proper courses in before beginning the nursing sequence and still finish in 4 years if the proper planning takes place prior to beginning (though almost nobody chooses to get to medical school via this path at the onset of college).
On another note, with nurses in such high demand, I don't see the fairness of someone taking a seat in a class without the intention of doing service in the nursing field.
I don't really see doctors as being a particularly fair group of people, though. Every year, a bunch of medical students only somewhat interested in dermatology take residency spots away from true skinophiles while the derms simply turn to them and say, "If you want my spot, come and take it."
For every nurse who leaves the profession for medical school, there are probably many others who cut their careers short for family, dissapointment in being overworked, or general dissatisfaction with the career after they get a taste of it. Leaving the bedside to become a doc isn't much different than becoming an NP IMO.
Being a nurse won't help you get into medical school, but having actually seen somebody with COPD might become helpful later on when your medical school makes you learn about it from a textbook. While they don't get much credit for knowing pathophysiology, nurses would know more about how the hospital works as well as a lot of the vocabulary foreign to most preclinical medical students.
It would be a tricky path, but it is possible to complete a nursing degree as a pre-med. Just be sure you know what you're doing.