We had the 'Surf' package that came with our HIA. It was okay, but not great by any means. Very slow much of the week, especially for downloading or uploading anything. Emailing was hit or miss. Web surfing was okay. We ended up using WhatsApp for all of our communication back home, which worked out well. We did not stream..
In general, the ship did not seem crowded, but lines were long at popular buffet stations; like the omelets to order station for example, and sometimes Guest Services (depending on time of day). The RS Rock Room and BB King's were packed during most performances, so had to get there early for good seats.
Hot tubs at the Sea View pool aft did not seem crowded. We did not hang out at the Lido pool area, so not sure about those. We did notice a lot of kids in the Lido pool though.