I have discussed this with a former domme. (I was NOT interested in BS, only GS)
I immensely enjoyed GS on my body, and as I sessioned more often, the women would push me further to consume. I found that I really enjoyed it certain times, and other times I would gag on it and not be able to consume much. It really did depend on what they were eating that day!
For me, the dynamic of the degradation and intimacy, yes, intimacy of the act was what really thrilled me.
I won't name names but a certain amazing domme that I know and love has MUCH too pungent GS for me to consume.
As far as BS, forget about your hope to do it without vomitting. I am told that it is a MUST to vomit because it is not healthy AT ALL to digest that. Even the hardcore FT guys that loved it had to vomit, out of health concerns.
One of those situations where the fantasy is maybe easier/better than the real thing.