While an actual tiny plane would be baller as hell to have flying around your kitchen entertaining you while your food simmers in a pan, the microplane -- which can be used to add zest to a dish -- isn't worth it. Microplanes can also double as graters for cheese, which is useful, but you should buy a standalone grater if you want freshly grated cheese. And because no one I know bakes lemon meringue pies, you probably won't need to add fresh lemon zest to any dishes you make either. Save your money and get a grater.
Electric milk frother
Oh, I'm sorry, do you run an illegal, underground coffee shop operating in your home? Then by all means buy yourself a handheld milk frother. Your neighbors will appreciate it! But if you think that while you're trying to get to work on time on a Monday morning, you're going to take more than five seconds to quickly froth some milk in your coffee-filled Hydro Flask, you're wrong.