I don't know any libertarians who engage in fantasy about such matters. And I know thousands. But hey, a guy like you who gets out plenty might meet all manner of goofy people.
I've even met goofy people on this board who think authoritarian government has worked, so that proves there are all kinds of goofs running around.
Truth is, that there even exists a fantasy about a libertarian society is your fantasy. One of the first things I read about libertarian philosophy many many years ago was the the statement, Since "utopia" is not an option,,,,,
Libertopia. i b e r t o p i a