My parents were "old school." When one kid brought measles, mumps, chicken pox home from school, we didn't social distance. We all got everything and got it over with. Of course, that was early '50s, before any of the effective vaccines came out. DW still "knows" which kid in our school gave her chicken pox because his parents sent him back to school before he was over it. No idea if she is correct, but it's a moot point. She wasn't very happy with that kid 40+ years later when she got shingles, but that's another thread.
As far as Covid-19 goes, I'm hoping the vaccines will obviate the need for the old style herd immunity, though I expect the "natural way" is more effective - but much more costly in terms of lives lost.
I've noticed that this is perhaps the most active thread I've seen on ER Forum. The old "self preservation" thing is very powerful, isn't it, though YMMV.