I'm starting to think about this along the "zero-worlds interpretation" - i.e. there is only one world, but it's not based on discrete particles with states, but on probability distributions. We perceive the world as if it was already mostly simple, but it's because we too are entangled with stuff. There are no many worlds of particles, because particles are not the building blocks of a world. If you look at it from the hypothetical computer simulating us, it's kind of like storing the set of all natural numbers - you can store slices of it in lists (and then quantum entanglement under MWI works by figuring out in which list you are) vs. storing a generator function.

I admit I'm still in the process of learning and figuring this stuff out.