Going to just point out (perhaps I misunderstand), but sous vide is not a crockpot way to cook. It's pretty easy (toss things into a bag, place in warm water) and it's delicious.

Since the temperature of the water bathing the meat (or veggie, etc) is a constant, you know exactly when your steak is a perfect medium rare. Not only is it cooked perfectly, the fats and marinade and etc are all sealed (quite literally) with the meat so the food is chock-full of flavor.