I think it's interesting how the muster drill is different depending on where your muster station is. We had one in the theater when we were on the Fantasy. We didn't have to bring life jackets, and two of my kids fell asleep in the theater on our laps. On the EBTA we were on deck 4 outside and were asked to stand in single file lines from back to front, deck railing being the front, with very little space between you and the guests around you. This wasn't a huge deal, except that their check-in system wasn't working and some guests were late/in the wrong space so we stood in that tight space in the humid Miami environment forever. One mom had to leave because her little girl was getting sick. All I could think was, gee, wish my muster station was in the theater. But I did pay attention
On our MSC cruise in the Med with 4 embarkation ports on a 7 night cruise, they do muster drills every single day. There was a muster drill for all those who embarked, but even though we waited, I'm guessing there are some people who thought they could miss it - so those people were asked to attend the makeup drill the following day, or the drill for whoever embarked the next day. Made for a lot of announcements, but safety first!