For me, aftercare is essential if the session has been a heavy one. However, if the session has not been so heavy, i can do without it. Master is generally a good judge of when i need it and when i don't, which is a good thing
Talking about a session that we had is also very important to us, and we make it a point to do that more often than not.
Same here, it's good to talk about what happened after the session is over, to share what each of you was thinking during the game. And sometimes, this can also provide more ideas to try out in the future