UK1 and I have several favorites in common. My favs also include:

• Zojirushi neuro fuzzy rice maker -- it's awesome even if you're a great rice maker because you don't have to worry about timing your rice to finish cooking at a specific time and you don't waste a burner on a pot of rice
  
• Meat temperature probe -- specifically a Thermaworks probe with an external alarm so it alerts me when the food reaches a pre-specified temperature
  
• Kitchen scales -- digital, precise to the gram. If you ever look for digital kitchen scales on Amazon, notice the items that it suggests people frequently purchase alongside digital scales

I'd also include:

• Double layer baking sheets -- no twisting and warping when you put it in the oven
  
• Wine fridge -- I have a Danby with two temperature zones, which is nice for chilling both white and red or different types of beers
  
• Immersion blender -- specifically a Kitchenaid model that's been discontinued. I burned mine out while trying to pulverize dried mandarin orange peel that was packed too tightly into a jar and within minutes had bought a replacement on eBay. (Thank goodness for eBay.) I won't make that mistake again.
  
• Silicone pot cover -- never mess around with saran wrap again when heating items in the microwave and never worry about being unable to find a lid that fits a specific pot
  
• Paella pan -- I have to mention this, since I got a lot of grief over in OMNI a year ago when my father (stepmother) gave me a paella pan. I was insulted because a) I am the family paella maker and it's ridiculous to think I wouldn't own my own paella pan and b) the paella pan I own was a gift from my father years ago.
  
• Riedel stemless wine glasses -- dishwasher safe and take up less room in the cabinet
  
• Microplane -- great for shaving cheese over pasta
  
• Mandoline -- don't laugh, but I have this one and it's awesome. I've owned it for 15+ years, using it at least once a week (and for a long time using it daily) and it still rocks
  
• Great knives, natch -- I'm a fan of both Henkels and Global
  
• Electric kettle -- I know Europeans and Asians reading this will think, "Well, duh. That's about as obvious as saying a fridge or stove is a great kitchen gadget," but they aren't that common in the US.
  
• French press coffee maker -- Great for making ice coffee, which is my daily brew.
  
• Martin Puryear pan scraper -- Cleaning up is a breeze with this tool
  
• Instant Pot -- I'd never heard of this before a couple months ago and once I did I didn't know how I ever lived without it. Pressure cooker + slow cooker + rice cooker + steamer + yogurt maker + braiser all in one appliance. I can caramelize onions overnight using the slow cooker and then serve them with perfectly cooked short ribs that I've pressure cooked in less than an hour. (Needless to say, I don't use the rice cooker function.)
  
• Silicone rubber bands -- Great for trussing poultry, etc., and machine washable so you never need to ask yourself, "Do I have cooking twine?"
  
• Parchment paper -- If I'm slow roasting anything in the over, I line the tray with parchment paper. It's awesome.
  
• Almost anything by Oxo -- If I'm shopping for a kitchen tool, I always look to see if Oxo makes a version of it. They have a very talented design team that takes commonplace tools and improves upon them.

Things I own but wish I used more frequently:

• KitchenAid mixer -- My kitchen is small, so it lives in my hall closet. I dig it out when I'm baking or whipping cream, but it doesn't get used as frequently as it would if it were on my countertop.
  
• Regular (Kitchenaid) blender -- I lent my Instant Pot to a friend so she could try it for a week and I'm borrowing her Vitamix in exchange. I love how easy it is to make green smoothies every morning with the Vitamix, but it takes up so much room. I'd probably do breakfast smoothies more frequently if I had my Kitchenaid blender on the counter. Instead, it's in the back of a cabinet.
  
• Silicone egg poaching pods -- Love poached eggs, but make them far too infrequently. This makes perfectly shaped poached eggs and takes all of the guesswork out of the cooking process.
  
• Food dehydrator -- I mainly use mine for drying herbs. Really should use it for drying fruits such as apples and bananas.

For lovers of gadgets, I highly recommend the kitchen section of Cool Tools. They've turned me on to a bunch of great items.