I did a B3B on Explorer, and two of the three I was on had HUGE delays in getting people off the ship mainly b/c of problems with Customs and Border Patrol. The morning that was the worst, they didn't even clear the ship to start debarking passengers until just before 8am, and then the lines just CRAWLED along.
When they finally let off the consecutive cruisers, we found out why the lines were so slow -- Terminal G doesn't have the facial recognition, and CBP had a grand total of TWO agents working that morning. Yes, that's two whole agents for almost 3,000 passengers.... no wonder it was so slow!
The consecutive cruisers didn't get through customs and back onto the ship until just before noon that day, when they were supposed to be already boarding the first two batches of oncoming passengers. That meant that the check-in area was full, the lines weren't moving, and the lines went out the door and down the sidewalk -- it was all kinds of messed up.
I really don't understand why they can't hook up a few tablets for the Facial Recognition System in Terminal G.... they have it down the block in Terminal A, and they have it retrofitted into the old Terminal 18 in Port Everglades, so why can't they do it in Terminal G?