Looking at the extended queue for this ride concerns me a bit. I'm not sure if it's long enough to accommodate all the guests that will ride it near opening/busy days. I would really hate the line to go outside the entrance... Magic Kingdom has the same problem with 7DMT.
Don't worry. Inside is a confusing nightmare of switchbacks in multiple rooms. I predict that many will become very disoriented inside the building. People working on it have told me they became somewhat lost inside, and that was without the queues and ropes. Grand opening may have people lining the walkway out of JP and around the corner backstage in toon lagoon, but that won't last for long.