Well, the fact that you didn't die sums it all up! Good for you.
I had friends in iron lungs during the polio epidemic- many people are still suffering from the effects of measles (see newist outbreak in the US:
https://www.sciencealert.com/anti-vaccine-activists-spark-a-state-s-worst-measles-outbreak-in-decades
Complications of measles, mumps and  the other 'childhood " diseases can be catastrophic.
Google 'herd immunity"
(BTW- if you had chicken pox, you might want to consider getting vaccinated. Shingles is no fun.)