Gee Cath, I answered one of your questions!
Okay, in my opinion, the involvement of the laity increased in response to Vatican II. Also, and most important to some,was the changing of the Mass from mandatory Latin (I know and a little bit of Greek) to permitting Masses to be celebrated in the vernacular. I happen to think that’s great. Very many of the people who post here think that’s a bad thing.
Before people start to jump on me, I know nothing in the documents of Vat II mandated or even suggested the abrogation of Latin as the language of the Mass. This happened several years after the end of the Council. However, many associate this liturgical change with Vatican II. However it happened, I’m glad it happened.