Generally, i would only recommend taking this route if you have some time before med school and have some time to really use the cert. and get something out of it.
A lot of my students ask me about this, and I have to remind them that there's a huge diff btwn the EMT basic, intermediate, and paramedic. The role of the basic is extremely limited, and when all the cool things are going down in the back of the truck, you're going to be stuck driving.
That being said, no matter what you do, you're going to get good experience. The company that I worked for (AMR, which i heartily do not endorse) made my life difficult with work/school schedules, and I got 'held over" many MANY times when I needed to be in school. It takes a lot of time to become what a medic will consider to be a "reliable" partner, and if you just can't put the time into it to become very profficient, I'd pick something else to do.