Who said that it will normally be used as the start of the queue? It is overflow, and by the time you get 5 feet inside the park you will know that you have come at the busiest time of the year and that you are in for a hellish day of ugly queues.
There are limits to how much a park is going to afford to theme a queue... especially a seldom used queue.
Much agreed, plus, when you have to wait several hours for a ride, it matters little what the queue is like; immersion wanes quickly when there are masses of tourists all around you.