The "culture of dissent and disbelief" isn't an innovation, 'sall.
Moving the altars was not mandated, but building them "away from the wall" was, starting in 1969.
Celebration versus populum was never mandated, but doing it is more convenient at a free-standing altar -- a fact that is mentioned in the Missal. It was already not unknown before the council: moving the altars made it permanent, expected, normal.
Growing up, I thought all those institutional buildings from the middle of the century were like that because it was cheaper or easier to build or something. I was shocked when my wife was studying at the Boston Architectural College and I found out there were people who thought buildings like that were a good idea. T
Also, there is the popular notion that we're here to "get" something ("we get to hear the Word and get the Eucharist"), without having to put anything into it ourselves.
But, what do I know, I'm only 27 :)
In most places you just went when you were ready.
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