Soldato
I never go during opening weekend. In the past, I go three weeks after release. Even been to a U/PG film showing at 1pm on a school day and there're are school aged kids. If they are ill, don't take them to the cinema.Have you thought about not going on opening night?
Kids films have kids in them at the start, but after a film is 1.5 weeks old, you'll find screens 15 percent capacity, so plenty space to be away from others.
It's been a long time since I saw a film less than a week after release for the reasons you list above.