While I can easily get out of hand with buying kitchen gadgets (I recently unloaded a ton of them to my family and friends last year), there are a few that I really do use on a regular basis.
I love my electric food steamer. I hate waiting like 15 minutes for a pot of water to come to a boil so I can steam something, and microwaving often makes a mess of foods when you try to steam in them - you wind up with chewy burnt edges, uneven cooking, etc... The electric food steamer starts steaming in like 10-15 seconds. I can make home fries much faster in the morning, hard boil eggs without them bumping around and getting cracked, poach fish, make perfect rice in it, and more.
I also love my potato ricer. I have the kind that looks like a giant garlic press, not the spinning crank one. It makes the most perfect mashed potatoes, and I never have to worry about over mixing them to get out the lumps. You don't even need to peel the potatoes at all, just toss them in the oven for about an hour and a half (depending on their size) and throw them in it - the skin stays in the ricer.
My electric pressure cooker is another favorite, especially when I want to make something for myself without using a ton of pots and pans, and I want a slow cooked meal fast.