When I was the bottom half of an M/s relationship for two years, aftercare was not just a "okay now we have to do this so you don't feel miserable" type of thing, but an important part of the scene itself.
To me, aftercare is an important element of processing the physical and emotional sensations during a scene. To use a bookish analogy, the end of the scene is the climax and aftercare is the falling action.
Sometimes certain types of aftercare ("aww, you just need some coco and snuggles") completely ruin the scene. Like rape play or degradation. Seems a bit pointless to go through intense situations that cause emotional turmoil, and as soon as you get to lie there and wallow in your struggle and anguish your top hands you a teddy bear and says he didn't mean any of it and you're a perfect princess. In situations where humiliation/degradation is the goal, I would prefer aftercare that is more along the lines of laying down in a quiet place and processing emotions until I'm finally ready to re-enter the real world, whereupon some cuddles and snuggles may be nice.
For me, the most important element of receiving aftercare is to make sure that my top was actually helping me reach the emotions that I wanted to reach.
For example, if I was trying out a new fetish I was shy or embarrassed about, if my top wanted to leave me alone in the corner for a while, I would feel like he didn't have a good time or he was tired of the scene, and that would make me feel upset.
Or, as stated above, if during a humiliation scene I was immediately inundated with snuggles and not given time to process my emotions, I would feel suffocated and meta-upset with what was going on.
In my kink life, aftercare is now negotiated along with the rest of the scene.