What a good question, and yes, definitely, you can cook slow and long in a high quality nonstick pan. Cooking in a slow-cooker appliance is not the only way to cook a meal in the style of fixing it and forgetting it. Stove top simmers are also rewarding to the cook who wants to go do something else while the meal magically appears a few hours later. In fact, sometimes in a slow cooker appliance, you can run the risk of the meal being too watery or steamy or poached rather than nice and browned and rich. Nonstick cooking requires lower, slower heat so it is ideal for tenderizing meat as the entire dish cooks along with it. You brown the meat first and use the same pan to tenderize the meal as it cooks for hours. My advice is that you choose a high quality nonstick pan that is heavy and has a lid. My guess is that you also are concerned about keeping the pan on heat for a long period of time, but since you will be cooking it on low heat, there is no danger of ruining the pan or burning the food. In fact, the advice for nonstick pans is not to cook higher than medium heat.
Editor of Carefree Cooking Magazine at www.teflon.com