I had the injection and would for future babies. You''re so full of love and endorphins that you dont really remember the third stage. It was delivered quickly, pain free (its nothing compared to a baby lol) and intact. My leg hurt the following day where they injected me but that's about it.
The placenta is a crazy ass looking thing but I remember the midwife telling me I had a beautiful placenta (erm, thanks for that) and asking if I was okay about it being used for research as it was very healthy looking at 2 weeks overdue. xx