I'm pretty ambivalent about it. To anyone who takes a non-materialistic view of the universe, it's just a completely obvious outcome. The only reason it perplexes so many is that "the enlightenment" really ruined thinking for hundreds of years and the damage may really never be undone. Materialism is obviously incomplete, and it's usually also accompanied by an active disdain for anything that cannot be accounted for as mechanistic process. It's offensively lazy and poisonous thinking as it leads to the nihilism of incessant naval-gazing. Nothing matters because we're all just matter doing pre-programmed stuff that won't matter because the future is mechanisticslly projected from this point in a fixed, mechanical way.

EW.

So, if the double slit experiment makes people think that the world is NOT just particles and processes, cool. It's just not all that special to anyone who (rightly, IMO) believes that the whole of creation is not just hard matter moving in ways that are pre-destined.