I'm due March 1, so I've been lurking here, too.
I actually feel like my prenatal care is pretty comprehensive (CNM homebirth MWs), which is fine by me. Among other things-- just to give an example-- I do plan on being screened for GD (they wouldn't have a problem with my declining testing), as I have a family history, and I plan on being screened for GBS, and etc., etc. So definitely waaaaay minimalist compared to the mainstream, but not totally hands-off, either.
On the other side of the equation, I am not being weighed at all (d/t eating disorder trigger issues), and my MWs have zero problem with that. I also decided to decline doppler, for a couple of reasons. First, because at the first appointment (~11 weeks) they might not be able to hear a HB anyway (even if all is fine). After a recent loss (my first pregnancy), I just didn't need the possibly needless worry, and feel that there's nothing/little I could do if baby had passed... which would be somewhat unlikely with zero warning. Second, because though I am only very, very minimally concerned about the (mostly theoretical) "risk" of u/s radiation, I figured it would be no big deal for me to skip hearing the heartbeat at 2 whole appointments (pretty sure they'll be able to hear with a fetoscope at my next-- 21+ weeks).
I really agonized over getting "routine"/"elective" u/s-- in fact, it was the one big question mark for me. Originally, I figured I would at least get the 20-week anatomy scan (never did care to know the sex, though). But long story as short as possible, considered my specific risks for things I could/would "do something about" (termination, in-utero surgery, change place or method of birth, etc.) and weighed those against the risk of m/c with amnio (which I would get with markers-- even if I ONLY got it with markers) and the risk presented by unnecessary intervention d/t possible misdiagnoses and I came out pretty even. Then I considered the high rate of false positives with the u/s (looks like 10%+ of people show "markers" for various issues, though maybe 0.5% have those issues), significant potential for needless worry about possible previa that almost always moves (esp in first time moms), the fact that some issues are very likely to be diagnosed or suspected by my MWs (and I have NO problem getting a diagnostic u/s if necessary), and the fact that I live 1/3 of a mile from a hospital with a Level 3B NICU.
The number of studies and articles I read... you wouldn't believe. Okay, YOU would, LOL, but most people...
In the end, I decided to decline the 20-week u/s, though it's a question I will revisit with future children, as I get older, etc. I don't feel 100% confident in that decision, but I feel much better about declining it than getting it done, so there's that.
Dr. Mom (my mom is an MD) is very supportive of all my plans to homebirth, etc., and she doesn't think declining u/s is CRAZY, but I know it wouldn't be her preference (she'd do one routine u/s-- just one, though). If and when it comes up with other friends and family... and it kinda will, because people want to see u/s pics, etc... I think that older people and people without kids probably won't think it odd-- or at least not any more odd than having a homebirth. But I get the feeling that people who have kids <10-15 years old will be aghast (secretly or not-so). Because it feels so "mandatory" nowadays.
What can you do? I think my rationale is sound, and I'm not about to claim it's like an overwhelmingly Good Thing (the way I feel about homebirth for low-risk women who want it, or any number of other choices). I feel like it's a pretty even choice (for me, personally) in terms of morbidity/mortality, and thus it comes down to personal preference and desire to avoid needless worry vs. the social difficulty of bucking the "mainstream." In the end, I'm okay erring on the former side.