There's 3 things that really stand out for me that I would say made a massive difference to my life:
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.
Tassimo coffee machine. Bought it 9 years ago, use it every day. Nice quick easy coffee. What's not to like.
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
1987 ford “exp”: bought it for $500, drove a few years, got hit and insurance paid out $500 and let me keep it, drove it with damage for another few months, sold it for $500.
Breville oven. Found it at a consignment shop for $17, looked to have been used once.
House: bought in 2017 in a rural area to get away from the city occasionally. Moved there permanently during Covid.
I have the ANOVA countertop oven myself. I use it way more than my regular sized oven. I had the Breville before that and I could even dehydrate fruit in it. Terrific appliance.