I have said it before and I will say it again.
Wash's = Camping
Gecko = Parking/ Tailgating
In the washes you will park next to somebody who at least knows somebody in your group, you will have neighbors you might get to know them you might not. They might even be with your group just need a little more room for their friends.
Over on Gecko, your friends will tell you where they are you might be able to park next to them you might not, your all going to hang out a little before and after a ride but your parking by yourself more then likely. You might meet people you like parked next to you and you might meet a a-hole who doesn't want any new friends. You never know.
In the washes, I can find a spot that is pretty much level and as long as I stay away from bushes and kiddie tracks I won't be getting stuck, for the most part. Over on Gecko I might get a spot that will take me hours to get enough people to move a car or flat bed trailer enough so I can get into s spot that it will take me longer to get level and unstuck at the end of the weekend then I will spend with my friends all weekend.