At my local, and on the high tide, there is little room to park a kite. I sometimes have to go a carpark before (after wasting time parking, walking to the beach, looking around, etc and there's like 1 hour of kite daylight left!!) my usual spot due to the crowds. But I always find a spot. No one says anything but sometimes their lines go over my kite or my lines go over theirs and we just have to all get along and wait for kiters to rig up and take off. Sometimes you get a tool that wants to self-launch and the kite sometimes bops over another kite or worse!
So to avoid frustrations from others and myself, I either park at a different spot and tack my way to where most of the others are to say hello, etc, or I sometimes have to sit and wait at the dunes for a spot and then quickly rig up the lines and take off.
Is there a particular etiquette when it comes to parking your kite and laying out the lines? Like all kites go behind the first ones on the beach and all lines must go parallel to any other lines already on the beach? So the kites closest to the water's edge get preference?
I can't imagine what it's like in some kite tourist spot like Egypt and Bali! Yikes!

It frustrates the hell out of me. If you are going to leave your kite on the beach for an extended period have the decency to roll up the lines and place your bar on your kite. This way there is plenty of room for others to launch. If it's really crowded and you can't go somewhere else it's possible to stack the kites to minimise space too.

the guy that's self-launching with less than 50m of clear space is a tool
and just because you're less experienced than him doesn't mean you can't tell him.
As kit33r said, etiquette is to roll up your lines immediately when you land.
Other than that I guess it comes back to the first rule of the water
avoid an accident at all cost
Happy Kiting