My absolute favorite kitchen gadget is my Vitamix. It's the best blender in the world (so powerful that it literally blends the seeds in raspberries), and it makes it so easy to make soups. I also got a cast iron pan a couple of years ago, and I rarely cook in anything else. I'm breaking in a cast iron dutch oven so I can get rid of my stainless steel saucepans.
I'm obsessed with my microplanes, but don't bother with the grate/measure one - the plain ones work the best. It's astonishing how much they get used even when I'm not in the midst of truffle season.
I've got a really good stiff whisk I've been into lately. It's huge, but the wires are stiff enough that it doesn't get bent. It's American-made and has a pretty copper handle, too. I'm considering throwing a lot of my other whisks away because I love this one so much.
Victorinox bread knife - just got it for Christmas and I absolutely swear by it. I can get 140+ slices out of a baguette, this thing is so sharp, and it leaves almost no crumbs. It also has an offset handle, so you wont' bang up your knuckles.
Wooden reamer - the best. I just can't with any other reamer that doesn't grip citrus like wood does. I've found glass/plastic/metal ones to be pointless.
small scoops/dishers with washer thingy - amazing for portioning out truffles. I have one I've had for over a decade and it's still going strong while others I've bought since broke on the first try
Kitchen Aid mixer and immersion blender - that stand mixer gets used weekly, and always has since my husband bought it for me 5-6 years ago. Immersion blender is great for soups
All-Clad set - I feel bad about even having this, although I love using them. My husband go it for me on our first wedding anniversary beacuse he was sorry for going throught a mid-life crisis thingy. For that same anniversary, I bought him a paperback book. Oops. I love the high-sided sauce pan and the high-sided pot that I use for caramel-making. I've kind of wrecked the little frying pan from toasting nuts in it, though. I guess I'll need to get some Barkeep's Friend for that.
Olivewood spatula with tapered flat top - the only thing that works for breaking up meat while browning. Nothing else has a hard/sharp enough edge.
This thread is reminding me how much I need to go through my drawers and get rid of crap.