A lot of people did grow up with the show have watched all the brady movies and spin off series, including myself. None of the post Brady Bunch stuff rise to icon status which people remember. There are no classic scenes or good lines that anyone remembers from the post Brady Bunch era, but we recall many from the original show, if for no other reason it was classic Brady Bunch stuff, and often it was sooooo pop culture 70s.

There was also Brady 5000, bini

Remember buna, 30% of American peoples watchit A Very Brady Christmas, hana

I have watched both Brady Bunch movies (Theatrical releases) several times and as far as I can determine all references are limited to the original TV series, not any of spins off or TV reunion movies.
It makes sense not to reference all the post-series stuff because most people have not seen the post series productions, or if they did, they've not watched it more than 1-2 times, while most viewers have watched the reruns of each episode dozens of times. The original TV series is a pop culture icon, but all "Brady" stuff that followed is not.