Dd isn't in regular daycare, but she does go to the child center at my gym 4-5 days a week. She is bf and I think that helps her a ton. I'm not worried about her getting a VPD. After doing a ton of research on the diseases, I decided that I wasn't that worried about most of them (although there are some that I would prefer she gets after she is 2 or 3, if she has to get them).
To be honest, dd was diagnosed with mumps last week. Her face is a little puffy, sometimes she is a little cranky from the swelling so we give her Motrin, and that is it. It's no big deal at all. She almost certainly got it from the child center, since that is the only place she has access to things other kids have their spit on.
For me, a big part of being comfortable not vaxing was accepting the fact that dd might get a VPD and being ok with that, and not just crossing my fingers and hoping that she never got sick. It wasn't just about being afraid of the vaxes, but also letting go of my fear of her getting sick.