Our cars have batteries on opposite sides so we park the cars with the batteries closest to each other. On the rare occassion that a car needs a jump, the cars are already situated conveniently. This may seem silly but if you have ever been caught with your cars too far apart, you realize the merits
The cars have to be parked somewhere so this is how we determined each other's parking place. Just yesterday, my battery decided to die in the heat. I have since bought extra long jumper cables but this really is more convenient for me.