Well, the first thing I should say upfront is it's very possible those were just better years for me, and that colors my memories of CC with happy nostalgia. I think it was how much simpler everything felt, from the administration to the classes. The atmosphere just seemed less pretentious, while the actual education wasn't really any better or worse than the same undergrad studies I got elsewhere. Not really great, but they weren't pretending it was. It was "highschool part 2, except attendance is strictly voluntary, admission is cheap but not effortlessly free, and the faculty has greater authority/autonomy to teach".
A few things that stick out in my memory are the greater number of non-traditional students, several of whom I made acquaintances with. They had more stories and life experience than the average 18/19/20 y/old and I thought were more interesting to talk to. Also, my CC had some vocational/non-academic tracks with accredited classes available as general electives, and I enjoyed stuff like some aviation classes, where again I got to hang around a totally different group of students.
It feels like it all was more developmentally important than the by-the-books liberal arts education I got at a private university, full of self-important pep-talks by upper level college administration, and professors who were only paid marginally better than the instructors at my CC...
(I want to emphasize this is about cookie cutter undergrad studies, and leaves out the other functions of universities, which a CC obviously couldn't compete with)