I did 13 credits of sciences at Umass Boston while also taking the
EMT-B course at Northeastern. Other than the class time (3 days a week, 3 hours a day, some all day saturdays for 15 weeks) it was a total breeze. Although we had tests every week and many "skills" (traction splint, bandaging, CPR, AED, assessments, assessments, assessments!) you would have to be a scalding ***** to fail an EMT-basic course.
I found the course, however, to be hugely useful not just from a practical point of view (like hey the guy next to me on the elevator just collapsed, what should I do) but also from a premed perspective where theory meets practice. It can be hard when studying enzymes or the krebs cycle to remember that all this junk is related to medicine and health care somehow. But knowing about glycolosis and ATP defintely augmented clinical street concepts for say hypo/hyperglycemia in a useful way.
As for the BEST premed use for the EMT certification, hands down you can't get a better gig then as a tech in an ER. You will be able to learn from ER docs on the floor, setup EKG machines, prep lines and get an awesome view into healthcare from both a nurse and doc perspective. You will also make about $15/hr and gain tons of clinical experience (you will also meet a ton of docs to make connections and opportunities to shaodw alongside).
Please don't take this is as an afront to the the guys and gals who drive the bus (they're heros with incredibly strong backs), but I wouldn't work on the vomit van for a second. The sad irony is that if you want to do it for a decent wage, you need to do transports not 911, and if you do transports folks like adcoms will not think you have clinical experience.
I have done ride alongs with the dedicated paramedic team at one of the best childrens hospitals in the country (I work at the hospital as a clinical researcher) and those cats are a very impressive group. But for me, I would rather watch the diagnosis, triage, and on-going critical care that happens in an ED then work the front lines of EMS. It all REALLY depends on what kind of experience you seek and what your personality type is.
All in all, I feel very strongly that the EMT-B course should be a mandatory requirement in order to graduate high school. It was, I feel, one of the most valuable and practical courses I've ever taken.
And never forget: air goes in and out, blood goes round and round; if one of those things stops, there's a problem. This is the gospel at every level of medicine
Ockham