so, my grandfather had polio and then died, he hadn't been vaccinated, left my granny with 2 small boys and no income. (pre- widow's benefits)
I grew up with the story of Helen keller, left deaf and blind after contracting measles aged 18 months.
There is a girl in our church, now 24, who is in a wheelchair, has no speech, can't communicate, has poor eyesight and several learning disabilities, she was a bright healthy 18 month old until she got menengitis.
One of my mum'd friends has a daughter, who is completely unresponsive, can't move, speak, eat, is blind and deaf. She is now about 30 (if she is still alive). he mum got rubella when she was pregnant.
One of dh friend's is infertile, didn't realise until he and his wife couldn't have kids. They have worked out it was from mumps as a teenager.
These are still real, live diseases, and the effects are much worse than the vaccines.