The last dry dock was pretty major: big screen TV above the Goofy pool, doubling of the spa/fitness center by building a roof above the bridge for the fitness center and expanding the spa to add couples verandahs. They also re-tiled the Mickey pool, converted the conference space on Deck 2 to Ocean's Quest, and they replaced the ice cream place with Goofy's Galley on Deck 9.
In the video they also noted how they repainted the hull with a newer more environmentally friendly paint, they removed both propellers for inspection and repair, they removed one of the side thrusters for inspection, and they replaced the main hot and cold water pipes.
All that in 2 weeks.
They also took all the lifeboats off for repair/maintenance. One of the amazing things was the amount of cleaning that went on in the last three days. All the furniture had been removed from the restaurants as well.