That's correct, AB4EJ. Generally speaking, the point of lining up is to put yourself higher in priority on the list of eventual recipients of the Model 3 once production starts next year. Having ordered plenty of iPhones at midnight online, though never lining up for one in person, I can see your misunderstanding why someone would concern themselves so far in advance for a car so far away, but if you consider the significance of a new car purchase as it compares to a simple smart phone upgrade, to me it almost makes more sense to pre-order a Model 3, even if it is 18 months+ in advance. Tesla has decided to only take pre-orders in store on March 31, following up with online pre-orders on April 1. The difference in your spot in the queue, and thus in the time you receive the car, if the car is anywhere close to as popular as Tesla hopes it'll be, could be months. I'd rather line up now than have to wait 6 more months to get the car once they finally start shipping.
Just my two cents.