I disagree, I think doing EMT-B school is fine for having something to add to your resume. Obviously it's not something that will set you too much apart from other applicants, but if you have an empty summer, it's good to get a different perspective of medicine.
Of course it's not a good idea to just state "I'm only doing this to pad my CV" to your instructors, but I always admitted I was applying to medical school. Theoretically you can run transports as a basic in between college and med school, I'm not sure what's wrong with that idea.
And having done the EMT course was a good way to learn some important rules of trauma and how to assess a patient for critical things that need to be quickly reversed.
I'm not sure why it matters whether the "Ivy league" college students did better or worse than students who already had experience in EMT training. It's a pass/fail exam. The reason why it's ok for someone to simply take the course to pad their CV is because it's not overly difficult, it's interesting, and it gives you interesting medical experience.
I recommend doing the accelerated summer course for pre-meds who want to get some fast-paced, relevant education. Any instructor that gets offended by a pre-med taking an EMT-B course needs to take a long look in the mirror and fix their insecurities in life. If the pre-med is a dick, that's another thing, but anyone that is med school caliber should have no problem getting through an EMT-B course.