This may not be the right place to ask what you should major in. As you keenly observed, nobody here works for medschool adcoms. I have, however, seen medschool adcom members at the SDN repeat exactly what the other guy said, "why waste the resources of a school by taking someone else's nursing education if you don't wanna be a nursing major?" Bear in mind that, especially in schools with associated nursing schools and schools that are state-funded, committee members are bound to think of your career as resources.
Also, the science courses you take for your nursing degrees may not count as prerequisites for every school, and that depends on what school you're getting your nursing degree on and what schools you're applying to. Something I wouldn't want on my mind while I was trying to polish my application and make it competitive.
Lastly, yes, it's true medical schools like a variety of majors. No, it does not mean a biology, biochemistry, or other STEM major will hurt you. Nor does it mean that a major in philosophy or in math will make up for a low GPA or a low MCAT. But, even if you get an amazing GPA and an amazing MCAT, you're one in a large and growing pool of undergrads applying who also did. The MCAT and GPA averages for almost every school in the top 50 increase yearly and, IIRC, the average MCAT for most top 20 schools is above the 95th percentile (I was in the 98th and I was average for my school's entering cohort last year.) They will also have checked their volunteering, shadowing, and research boxes, so whatever you go into you should be able to make something worth remembering, and, though it does not absolve you from having a solid science background that you can defend and use to prep for the MCAT, being a major in something more unusual adds to the things that you can make the interviewers and adcoms remember you by. Take it from a bio+anthro double major who spoke twice as much about anthropology than about biology in interviews.