I have spent a lot of time thinking and talking about MD/PhD with various people. I love my major (Biochemistry), and I've been doing research since before my freshman year in Immunology. My plan was always to go to med school, and all of a sudden, people start asking me, "You're going into research, right?" I definitely have an enthusiasm when it comes to the basic sciences; I love going to seminars, lab meetings, etc. What finally put things in perspective for me was working at a comperhensive cancer center this summer where I spent 4 days a week in the lab and Fridays shadowing in the clinic. Friday was the highlight of my week. I realized that I don't want to spend that much time at the benchtop. Also, my PI was an MD, so it is possible to do traslational research without spending an extra 3+ years in school. I'm also thinking about maybe doing a year research fellowship at some point because I do want to be in a university hospital or similar setting where there is reasearch going on. Not to mention, I accepted early assurance at UB, and so to apply to MD/PhD, I would have had to take the MCAT which I wouldn't have had to otherwise.
Anyway, long story short, I know what you're going through. Just when I think the debate is over, someone else asks me about research. At the least I'm flattered because I've been trusted with my own projects and people think I would be sucessful at it! Who knows...maybe I'll go back and get a PhD someday, but for now, I want to work with patients first.