Grew up vegetarian, no particular need for a crockpot, so I can't see the advantage of a crockpot over a dutch oven for things like chili, stew, anyhing needing a sauteed onion base, but I can see how they might be helpful for the lazy.
You could probably make a number of really great Asian hot-pot/broth-heavy meals in a crockpot since they are all-in-one one-shot deals. Line the bottom full of sliced pork belly, a middle layer full of ripe-ass kimchi and accompanying juice, a knob of ginger and garlic, a dollop of some gochujang and just a little water and a bit of stock mix or real stock in place of that, plus a block of tofu and dduk rice cakes plus green and white onion slices towards the end, you'd have a mean kimchijjigae.