I was in your shoes last year. In my experience, schools don't really care that you did a masters degree. But it does factor in to raise your overall GPA which is nice (it's just not given any more "credit" or anything). Hopefully your pre req grades are pretty high too....so your overall GPA will have all 3 of your transcripts factored in. There are a lot of breakdowns the PTCAS GPAs give in addition to overall. There is one for just undergrad and grad....so your schools can see the breakdown in they choose, but again, I didn't see it as a factor either for or against. If your first GPA was from a really long time ago, I think that "helps" in the sense it's more forgivable. For example, I graduated 12 years ago from undegrad....all of my "bad" grades from my frosh and sophomore years are 14-15 years old. So it's reasonable to see that I've changed and my recent grades show it. If I had the same bad grades from 2 years ago, I think that would be a harder sell.
In retrospect, I wish I had looked more closely at the types of students in different programs. I'm an older non traditional student in a very traditional program. I'm one of two older students in the entire class of 50 and the only one with kids. It's a pretty lonely road but, more importantly, the program then gears towards extremely full time, traditional students who eat, sleep and breath it. It's disconcerting to be studying your brains out, every free moment and still realize you are lucky to be putting in even half the hours that the other students are (just pointing out that it would feel more balanced along the bell curve if there was a bigger variety of students. But because everyone's background is so similar and mine is so different it's a big chasm. I don't think they favor non traditionals here either and now I understand why....it's not cognitive ability, it's hours available to keep up, lol)