I forgot to mention this, but I really enjoyed the bi-level areas that spawned keys to unlock doors (can't remember the exact names of them tho). There were two: one that spawned a key above ground and one that spawned a key below ground and behind a column.
I really LOVED the behind the column one. When I first came upon it, someone was standing behind the column waiting for the key to spawn and she was meditating. At first I thought the column was meditating. Then I thought I had to meditate to spawn the key so I started meditating, but she said she was just doing it to pass the time, and I laughed out loud at that.
Then me and another player decided to go behind the column too, and we did some chatting to pass the time. Something about the speech bubbles and the column was hilarious to me. Or when someone moved slightly and a teensy bit of their avatar peeked out from the side. We also had to team up so that we could all use the same key, which was great, and probably the only instance of spontaneous street collaboration I have ever seen in Glitch, i.e., among players who didn't already know each other from chat.
It had this kind of stranded in an elevator/stuck in a long line effect for the players and I liked the way it played out, and the novelty of not being able to see exactly what was happening was delightful.