I don't think the point of being an EMT is to try to play doctor by being able to prescribe medicine etc. Rather, its a way to find good clinical experience in which you'll get exposure to the field on some level and realize that dealing with real world medicine is not the same thing as watching what occurs on fictional tv shows or movies.
You can get clinical experience a number of ways. You don't need to be an EMT-B or PCT to get clinical experience. Yes, one way is to work in the field either as an EMT, PCT, Phlebotomist, etc. etc. etc. etc.
However, there are also other ways to get exposure to clinical medicine, like volunteering in the escort service so you get to familiarize yourself with the hospital, volunteering at an ER or SICU waiting room, or child life.
Or you can volunteer with Hospice, Pediatric clinics, general practice clinics in rural areas where they need translators for spanish speakers. Little little things like that give exposure to medicine.
Shadowing is another thing to do. Shadowing is good and all but it SHOULD NOT substitute volunteerism as both REL and
LizzyM who are adcom members will tell you.
Other clinical exposure can come from medical mission trips abroad or from various types of clinic opportunities.
Just whatever you do, make sure you've at least had some exposure to medicine because while you don't know how you'll feel coming out of med school and residency, they want to see that you weren't completely blind going in.