hehe.. I'm not sure what "real" microvibrato is, since I thought I had made up the term

going back to the record, the vibrato touches that I remember are bigger than I had remembered, e.g. 6:47 in "Only Skin". I still love it, though.
A couple of other points.
1. I mentioned Simons SDC and Reynolds not b/c they were "authority figures", but because neither of them (as far as I know) are hugely inclined to this sort of thing in general, despite both having fairly catholic tastes. FWIW, they're definitely overall both on the more "darker, electronic, less earthy" side of things. And you could add the bot of woe to that list too, I suppose.
2. I don't think "at best pastoral folk" quite fits it. Pastoral, yes, folk, clearly, but there's more. Perhaps the orchestration is tripping you up... You said you didn't like it in general, since it sounds cheap and wrong to you. Fair enough in general, but I really think this orchestration is unlike almost any other orchestration on a pop record (except of course Van Dyke Parks' other work). On "Emily", it's all lurching and hopping behind the harp and voice, creating a really interesting rhythmic interplay. This is anything but ordinary, slapped on bad pop orchestration. I think the orchestration adds a whole 'nother layer to the pastoral folk already stretched to the breaking point by the song structures (do I just mean length? maybe).
3. As for the bjork comparisons, they of course appeal to me since I am a big fan. I actually think that there are only a few moments of similarity the Newsom's voice to bjork's. I find some of the more intricate harpwork reminds me a little of Zeena Parkins' playing on Vespertine, which I liked a lot.