No doubt there are both advantages and disadvantages to vaccination in general, but it's not automatically true that contracting diseases in childhood confers a net benefit. Regular measles can cause brain damage, mumps can cause meningitis, deafness, and other serious problems, and German measles, though fairly mild even in an adult, causes birth defects and miscarriage (the unvaccinated girl discussed in this article had reached childbearing age without having these diseases). Some of these diseases are much more severe if contracted in adulthood. And then there's sneaky chickenpox, which tends to lie dormant for decades after a childhood infection, and then pop up in old age as painful shingles (sometimes with permanent nerve damage).
I had a friend in his late 20's that had never had chicken pox. He had a 4 year old daughter and a 6 week old daughter. He four year old gave him the chicken pox. This was before the vaccine. He is now living in a nursing home with severe brain damage secondary to enchepalitis. Sad story. The only reason we do not have more children dead like you see if you vist an old cemetery with the children lined up that died before 5 is because of immunizations. Immunizations have saved more lives than anything else ever done by medicine including antibiotics. Those who do not vaccinate their children only get by because the rest of the population does. Those that want to go without vaccinating their children are doing their children and society a disservice. They are like pacifists they only survive due to the safe society they live in. Talk to your older parents and grand parents and see how mothers were thrilled that there were vaccinations developed. Much human suffering was overcome. Talk to someone crippled by polio or that had a child in a iron lung. My mother lost a sister who was 7 years old to small pox. All the parents who hate immunizations do not understand how misguided they are in their outlook. I think of this every year during decoration when I look at my GGF and GGGM family graves and there are 6 children buried before the age of 5. I also think of it because I am a physician and do not have to tell parents their children have died of a totally preventable disease.