I don't use a lot of power tools, but here are a few I use over and over and over.
My food processor has a special blade and push-button operation for making dough. Makes my weekly batch of pizza dough in 30 seconds flat. Less than half a minute to make a week's worth of soffrito, salsa verde or gazpacho.
My Slow Cooker needs 90 minutes to make Psychedelic Polenta when I'm willing to give up an hour of soulful, peaceful stirring.
My Mini-Blender/Stick Blender is great for small batches of all kinds of things, like the flavor base syrup for homemade ginger ale.
Ice cream Maker