I got a stainless steel rice cooker and I love it. It is pretty convenient although I did fine without one for a while.
I also have a countertop toaster oven that I cook a ton of stuff in. If I use my oven, I am cooking a bunch of stuff (roasting veggies, squash, etc, multiple pans). I've probably used my oven 3 times in the past year. I never use it in summer.
You can't out-exercise poor eating habits.