You’ve obviously made a very generalized statement, but a lot who felt otherwise just quietly stopped going at all (at least that’s what I’ve gleaned from friends and family members from that era). Seminarians who objected to the new stuff didn’t last long. I also get the impression from others that they think the Mass was just translated and lay people got to do more stuff, not really recognizing how many prayers were changed or suppressed.
There were also real issues before the Council that, when the discipline was loosened, exploded. For many, it felt like the best time ever–that made a huge impression that even the sharp decline in practically everything good in the Church that came after can’t seem to erase.
See pages 75 (starting halfway down) to 76 and 94 to 96 here, where a priest who was a seminarian explains how fun and exciting it all was compared to their life in the seminary just a year or two before (he is a rare one for whom that impression wore off… )
The whole thing is a good read on how we got to where we are.
Those of us born later see how seminaries, monasteries, and churches have emptied and how reverence for the Blessed Sacrament is mimnimum and its appreciation as a propitiatory sacrifice is almost non-existent. We have more information to see how the Saints and Fathers and and the Church’s members in the past treated the liturgy and their faith in general.
The music and other aesthetics attached to the new Mass are also more strictly tied to the aesthetics of the late 60s and 70s–and with all due respect to those who had their hayday in that time, the aesthetics of that time seem pretty outdated, cheap, and cheesy to most of us who came later. The old Mass and all that went along with it, while not literally timeless, still have an organic connection reaching back centuries that give it a more universal and timeless feel.
Anyway, that’s just my opinion…
My own experience, I went to a TLM as a curiosity the first time (only at the time being vaguely aware that Mass used to be in Latin and the priest faced the wall). Afterward, I honestly couldn’t understand why we would have dumped that for what we had…