On our cruise there were about 2,7000 passengers which is close the ships double occupancy level, but not over it.
On our sea day, every bar was completely slammed. Waits for drinks were long, and when you did get hem the bartenders were so overworked and stressed that drinks came out incorrect. I ordered a white russian and it came out just milk and vodka. The bartender forgot to add the kahlua.
There were lines just to get into the Red Frog Pub. When you got in, there was no place to sit down and enjoy a drink. Standing room only.