I haven't tried it, but I believe it's a good idea. You're absolutely right: much of what animals learn, including humans, is subconscious, which is a more powerful processor than the conscious. For example, you will automatically learn that pawns tend to advance in the center, that when knights go to the edge that that player usually loses, that pawns race toward the "finish line" in the endgame, etc. Also, merely speeding up things can allow you to see the bigger picture that you wouldn't ordinarily see. That's also true in music, by the way. For example, I once listened to the Beatles' song "Magical Mystery Tour" on high speed while copying a tape at high speed, and the overall structure, bass lines, and out-of-key notes became much clearer strategically, so that the Beatles' songwriting strategy became clear. (I'm also a songwriter.)
Watching GM games sped up to build patterns
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Moves are memorable because there's context. For example you've analyzed yourself and guessed a move or read some annotation of what's going on.
They make you stronger because you're able to apply the underlying ideas to similar positions.
My impression is that speed viewing wouldn't be useful.
GM games sped up x2 might be good though. Considering GM games can take upwards of 6 hours to finish, x2 would mean you spend ~3 hours with a game.
So I've heard that GMs usually build patterns of intuition from seeing thousands of moves, captures, checks, etc. I was wondering if a beginner could accelerate that by watching games of GMs sped up (x2 or more). Although your brain won't be able to see every single detail and study in depth, but maybe it'll pick up on the patterns subconsciously? Just a theory and was wondering if someone has tried.