Another vote for YouCamps!
If I want zero crowds, I’m happy to pay (at least a certain amount!). Never had to deal with rowdy crowds at a legitimate YouCamp property (I say that because I’ve seen some places that are listed elsewhere popping up on there - not sure YouCamp would be happy with that!)
I’m one of those people who goes camping for the peace and quiet, to get away from the big smoke for a bit. Last thing I want is to put up with rowdy crowds...
That said, I’ve also had zero issues when I’ve camped at pubs, free camps when touring, etc.
Peak periods at popular spots are the only times I’ve dealt with this - Gordon Country years ago at Easter (it rained, and that brought out the idiots who thought they’d take on the campsite tracks in 2WD like a bull at a gate...
), and National Parks/etc at any public holiday (dogs off lead causing trouble, yahoos yelling/“singing” and playing obnoxious music at full volume all night, driving drunk, etc.) That’s when we book a YouCamp instead now!