I think it's worth doing at least once. It's a concentration of aviation, aviating, and aviators that is far greater than the sum of its parts IMO. There are nooks and crannies of just-plain-cool stuff EVERYWHERE to discover, and which do not exist anywhere else so readily. My own favorites are the fly market and the antique aviation bookseller. Browsing old books and magazines, some from the 1910s and 1920s is just awesome to me, and something I can't replicate at that scale anywhere.
The fly-in arrival is another thing altogether, and while it is amazing to see in action and be a part of without incident, it is a "yellow alert" slog all the way through the procedure, and for me, it was an equal mix of pride in our ATC systems and personnel, and abject terror worrying about spacing with the bugsmasher in front of me, or the dude that missed his call to turn base and I'm behind HIM headed to Lake Winnebago, and worried about the result. I can absolutely see arriving via airlines or driving in from a remote spot instead of flying in. I don't think parking your personal plane in the mud, nor camping in a tent with the masses is a required part of the experience. I am one who dislikes camping intensely, though. Others almost certainly derive bonus joy from the evening socializing and shenanigans.
$0.02