The reason why drilling helps us is because it forces us to be intentional.
Intention in turn focuses attention towards specifics and detail.
Remember, it doesn’t really matter how you drill, so much as using drilling as a creative means for being intentional.
Keep in mind Jiu-Jitsu is about subtleties over strength and speed. Such subtleties are simple, but take time before they’re cognitively and kinesthetically grasped.