I was in New Mexico recently and Google Maps gave me a route from Bandelier National Monument to Santa Fe that included a “shortcut” through the Los Alamos National Laboratory campus. I got to meet a security guard.
So, yes. I would say I have experienced this.
There’s nothing in the constitution about the filibuster. It’s just a Senate rule and the current version (where you don’t have to make long speeches in an ultimately doomed attempt to block legislation with majority support) dates to the 1970’s. They adopted it because in the TV era, Senators were filibustering just to get on the national news and make a name for themselves.