Toasting a meat & cheese sandwich open faced, with meat on one slice and cheese on the other, rather than grilling in the frying pan, less greasy.
A quick late snack of just a melty slice of cheese on toast.
It uses 110 rather than 220 and takes much less time to preheat.
I have one casserole dish to fit in it. It makes 4 huge servings as a one dish meal and 6 good size servings if you have other sides.
Cooking for one it just makes more sense.
Having said all that, in the Winter time I use the oven. My regular electric bill is quite small and roasting doesn't seem to make it much higher and the AC/Heating unit draws a LOT of power when used for heating. My first wintertime electric bill was more than double my usual one, so I use the oven and Leave the door open while it cools after cooking, same as when I do use the TO. Save the heat for me.
If you can't see the bright side of life, polish the dull side.