There are toasters at the Food Court but they are intended for those purchasing food that needs toasting from the Food Court. Though no one will say anything, those bringing their own food in there to toast add to the long lines and it is unfair to those who are buying bagels, etc. at the food court.
Toasters and other cooking appliances are not allowed in the standard hotel rooms.
Those who do like to cook while at DW should check out the villas and other options that include cooking facilities within the rooms. There are quite a few options available.