1. no. Unless it is a very very bad party, they happen.
2. well, yeah, I often watch health bars and I have rng feet... so... if someone needs it, I may be about to die
3. no, not really
4. no, as a WHM? only time its even close to an issue is low level stuff where I am glaring my heart out
5. no.
6. if I am the non-healer and see something attacking the healer, yes, all the time.
7. pretty sure they did away with that, if they havent then, no
8. not usually. in the occasional alliance raids if the other parties healers are having issues, then yes, then I do.