There’s 3 things that really stand out for me that I would say made a massive difference to my life:
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Cordless screw driver. Bought the day after building a flat pack bed with a crappy screw.driver that just shredded my hand. Thought it was frivolous at the time, but I’ve used it so much since. It’s light, small enough to fit in my pocket and good for 90% of DIY tasks.
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Tassimo coffee machine. Bought it 9 years ago, use it every day. Nice quick easy coffee. What’s not to like.
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My first DSLR camera. It was a Nikon D50 back in 2005/6 and it sparked my interest in photography to this day. It gave me a hobby I can take lots of places and do it alone or with others. I never loved the D50 camera itself, but I did get some really nice shots with it
The thing that weirds me out about the common bidet answer is how certain societies thought otherwise was a good idea in the first place. I don’t know anyone here that would call it revolutionary since 90% of the places you go have a hose for your butt sitting right next to you.