I'm a grouch.
I don't like any of them. All this "Car up" and "Car back" drives me crazy.
I have been riding one of these organized rides per year only because I used to run the damn thing 20+ years ago. My secret for survival is to get to the back leaving and then haul butt past the slow pokes after about 5 miles. I can then ride by myself without dodging the squirrels at the back or dealing with the folks trying to "win" the non-race at the front.
I still get PO'd when they make me take this boatload of crap when I check in even though I have ridden my bike to the start and I have nowhere to put it. It usually takes me a good 10 minutes to find a dumpster to get rid of that stuff.
In other words I would rather ride these routes by myself or with a select group of friends. It is safer, more pleasant, and cheaper. That is a winning trifecta.
Rant over.