We disembarked in Valparaiso on 12/23 and it was easily one of the weirdest disembarkation I've ever had (in over 20 cruises across 3 cruise lines and various continents). The gangway itself was rather... sketchy - and harder to navigate than the one we had in Manta which was gangways attached to shipping containers. This is the first time I was aware there were doors on deck 4 on a S-class ship!
Considering our tour guide in Lima said they get 20 ships a year during their "high season" - which was just starting when we got there, I imagine Valparaiso (which is technically a smaller port than Lima) probably has similar traffic and only a few of those are turn-over days. The port itself is not a dedicated cruise port - it's primarily a shipping port so handling the turn-over on these ships is not very common (unlike Civi or Miami or even Los Angeles). We had a post-cruise tour ending at the airport, but the disembarkation was a mess (though slightly better organized than it could have been) and once we arrived in the port building, there was *no* information on where to go, so it was a challenge getting to the bus. It was annoying, but honestly not unsurprising. It was also obvious on the tour that it wasn't a commonly run tour - the guide was fine, but the bus driver had issues and didn't know where he was going all the time so we ended up with a near mutiny on the bus to get to the airport (we had plenty of time once we got there, but it was an... interesting tour).
All of this to say - if you're embarking/disembarking at a less commonly used cruise port (like Valparaiso, Lima, Bali, etc.), pack your patience and tolerance as things can take time. But the goal is to have everyone on the ship by departure, so once you're in line - you'll get there. The staff is probably just as frustrated by the hassle as you are. Embarkation is a short, anxious time, but once you're on board, you'll have an amazing cruise! We were thrilled with the service of the staff on our cruise - I hope you are enjoying the ship, and I highly recommend attending all of Milos's Beyond the Podium talks! He's probably the best entertainment on the ship!