For all the times I've called those kinds of numbers, I've been mostly helped. Usually, I just needed to talk about something truly and deeply bothering me, that was causing my deep depression (so I've used it as a warm line). There have been a couple times where it wasn't a good fit between me and the person on the other end. One time I complained.
I've never really talked about my own suicidal ideation before with the hotlines, because of what you were saying about the hospital. I have no idea if they'd send me and I wouldn't want to chance it by talking about it.
I do think that people post things like that on Facebook, because they do care. But its like, ignorant and well-meaning at the same time. I do understand the frustration of having an unavailable friend, who then posts **** like that. Its maddeningly ironic.