Same here, I do adore a lot of actresses but no one else right now appeals to me onscreen the way YM does. Actually, I think I would adore Shu Chang just as much (she also has that unique appeal and charisma onscreen, and in fact probably has better acting skills, though she is less stunning in terms of looks than YM) but unfortunately she just doesn't have that many series out for me to watch so far. (Though I do have quite a number of SC's older dramas on my (extremely long) "to-watch" list too!)
I don't think YM will be acting too much less just because she is also producing--it still sounds like she has a pretty full filming schedule planned for the rest of the year (although less crazy than before, but that's probably for the best since she was long overdue for a break). And I definitely also prefer TV dramas over movies, but I guess that hasn't quite kicked in for me yet because there are still so many of her dramas I haven't gotten around to watching yet, so that should keep me preoccupied for some time at least.