Don't confuse Ride Wait Time with Ride Physical Length. Adding Fastpass to POTC will actually decrease the number of people in line significantly needing less physical quene space. Lets just say POTC is 3,000pph and has a line of 1 hour. That means the quene needs to hold 3,000 people.
Now adding fastpass into the equation. Assume Fastpass is getting 60% of the ride capacity (it ranges from 50-80 depending on the ride I've heard). Now Pirates wait time has ballooned to 1.25 hours instead of 1 hour. However now only (3,000*(1-.6)) 1,200 people per hour from the stand by line are able to ride per hour. That means that even though the wait time increased from 1 to 1.25 hours, there are only 1,500 people in line instead of the original 3,000.
You are about to see a very similar case with SWGE:SR. The extended queue through the shipping containers is about to become very rare, even though wait times will also increase