I've got a number of things over the years.
My little De'Longhi coffee machine is used daily. It's not a huge expensive one, barely cost much more than a pod machine. It does pods but I prefer ground coffee. Everyone loves the coffee it makes.
Ladder into my roof - tradesmen love it and roof cavity is large enough to stand upright and walk around, so I have things stored up there. Would really like to get flooring down up there but will need to wait a little bit for that.
My dad gave me a little electric screwdriver for my birthday years ago. I was appropriately grateful but thinking to myself I'd never use it. It is the best thing ever and now that he's passed away, quite treasured and I think of him every time I use it.
On a similar theme mum gave me an air fryer a few years ago. Thought I'd never use it, but it's great and was really handy when I hosted Christmas last year.
My robo vacs - loved my first one but it was low tech and used bumping to redirect. Got a newer version that uses sensors instead as didn't want new kitchen banged up.
I renovated my kitchen and bathroom/laundry last year they were around 30+ years old and I've lived here nearly half that time. Got a great single drawer Fisher and Paykel dishwasher (didn't have one previously) plus an induction cooktop. In the bathroom/laundry got a pull out pantry and it is way better than I imagined. Holds all bottles and so easy to access. The Fisher and Paykel 10 kg front loader seemed like overkill for one person but it's amazing. Washes clothes so much better than my prior top loader. Even though I've got a bigger hot water system, dishwasher, much bigger washing machine my power usage has dropped by a third. Can't quite figure out why but not complaining about that!
Picture of my bathroom pantry as it's just so amazing! I've got shower stuff on the far side and laundry stuff on the washing machine side.