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
My recliner that I bought with one of the first Covid check. I have horrendous back issues (3 major surgeries and constant pain) and having another resting/sleep area has been a lifesaver many times. Currently pregnant and it’s one of the only places I can sleep.
This set of 2 grabbers from Amazon. They weren’t super expensive but nicer than other grabbers commonly bought by others. They have been used daily by me, my toddler plays with them, they get dropped, etc. and they perform so well. I can pick up the tiniest item off the floor, a piece of paper, etc. with no issues. Had them 3 years. I keep one on each floor of the house and they save my back so much. It’s one of the only ways I can do chores and keep the floor clean from a toddler.
Silly, but this last year I really appreciated having a laminator at home. It’s nothing fancy- just a simple one from Scotch from the store. I’ve laminated different rules for games (card games where we wrote out the rules) and my son absolutely LOVES when I draw him characters and items from his favorite shows, laminate them, and then he plays with them for months. It’s saved us a ton of money buying toys he doesn’t need, stores easily, and he loves it. It also gets out some of the creative side that I kind of lost the last few years.