This is just my opinion -- and other people may have a different view -- but I wouldn't even consider cooking in these suites. They don't really have a "kitchen" -- it's really just a small counter area. It's more like an "office" kitchen as opposed to a "home" kitchen. They really aren't set up for cooking meals like the kitchens in the villas. I'm not even sure if cooking "appliances" are allowed in these suites -- especially a crockpot that's going to be unattended for hours while in use. The refrigerator is small and it would be a challenge to have enough food for cooking more than a meal or two stored in it. It's great for holding drinks, snacks, and leftovers but it's not really big enough to be keeping meat/vegetables in it unless that's all you're putting in it. There is a small microwave in the room that you could use to cook things. I could see having sandwich "fixings" in the room and maybe some of those individual-sized microwaveable soups, but that's about as complex as I would get for preparing a meal there.
We stayed in a Lion King suite last June and did not do a dining plan. We drive, so we brought breakfast food with us to eat in the room every morning but nothing that needed to be "cooked". We had bagels, cereal, granola bars, oatmeal, and a few other odds and ends. We also had some snack foods for the room: pretzels, microwave popcorn, etc. We ate lunch and dinner in the parks or at the resort every day (sometimes we ate over at Pop Century). Coming back to the room to eat a meal would kill a lot of time that we could be spending in the parks.
If you're trying to save money on food while staying at Disney, there are lots of ways to do that that don't involve all out cooking in the room. I know I've seen threads devoted to that subject. Some simple things to do are to eat breakfast in the room; share meals where allowed (even the counter service meals are sometimes big enough to be shared); counter service restaurants always advertise combo meals but any sandwich can be purchased alone -- you don't have to order it as a combo -- and it's usually $2-3 cheaper. In our last 5 trips we have only gotten the dining plan once and that was because it was free and it saved us more money than the room discount would have. A lot of people choose not to use the dining plans offered and just pay out of pocket for their meals.
Again, JMO, but there is no way I'd be trying to cook a meal in the suite.