That's really cool. I've wondered how feasible it would be to stay current with national registry while going through med school. In my head I have a dream of being able to continue volunteering as a firefighter / medic every so often while going through med school, although in reality I imagine this wouldn't be practical (both in terms of time committment and staying sharp on skills).
Truthfully, I don't work too much. Teaching is ~3 hours a week and I don't do it around exams (usually). I tend to only pick up shifts on breaks or just after exams. However, I tend to think I'm more conservative when it comes to work as other medics, who are are also medical students, seem to work more. A 3rd year I know tends to put in about 24 hours a month, as does another. I knew medic who worked full time while in medical school. She work nights at a slow ambulance service. An attending I know worked for a flight service while in medical school. Anyhow, it is doable. I did have to quit my "911" job as I couldn't maintain the minimum required hours (24/month). I'm much more comfortable doing critical care as the patients are usually stable and I don't have to worry much about keeping my skills "up" as intubation is a rarity, as is lining someone in the back of a moving ambulance. Much of the skill of critical care is between the ears and I feel that is something I have been able to maintain, if not enhance, since starting medical school. But, I honestly miss doing 911 calls, so I might start volunteering to get that aspect.
Anyhow, for what it is worth, I do think having worked as a medic has been an advantage to some extent. I have had to adjust to taking a history using open-ended questions and using subtle approaches to coaxing a history out of a patient (e.g. "tell me more", "go on", and *silence*), which is rarely done in EMS, but I don't think the adjustment was too difficult. Much of cardiac and pulmonary physiology was a breeze. I didn't ever open an ECG book when everyone else was losing their minds. Lung sounds are cake, and I'm not nervous when interacting with a real patient for the first time. I'm not having to learn terms like "dyspnea", "orthopnea", or "syncope" like my classmates, which is nice. This is not to say I'm honoring everything (actually I haven't honored anything, I'd be solid B student if they used letter grades), but just that I don't think I've stressed as much, and maybe have even taken it easy at
some points.
Anyhow, some of my info for the pre-med EMTs and medics... 32Q, 3.8c/3.7s. I didn't do any research. The only volunteering I did was pre-college when I was an EMT. I shadowed for a total of 4 hours to get a LOR from a DO for my apps to DO schools. I noted the hours I spent in-hospital as part of my medic training (which for me was ~400 hours). I played up my medic experience in the prehospital and critical care setting. I made note of the different environments that I worked (urban, suburban, and rural), and my experience with being part of the EMS response to Hurricanes Katrina and Rita. I also made sure to mention my teaching experiences. (Of course, I did have plenty of other experiences to talk about; I didn't solely rely on my EMS experiences.)
Really play up your experiences working as a paramedic. They are very unique. If you have spent a lot of time as an EMT or paramedic, you will have experienced more medicine and patient care than almost all other applicants, and in a way that almost all medical students and physicians never will. However, you should realize that most interviewers and ad-coms will not know much, if anything, about EMS.
Anyhow, I gotta get to studying. It's good to see other medics applying and other medics working as docs. Best of luck!