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
A plot of land in a place I like. Nothing fancy or huge, just a place to be by myself and enjoy a nice bonfire away from people.
Headphones. The old clunky ones that cover your whole ears. I love them! They feel like a hug and I use them all the time while listening to spooky stories. Bought them in a sale about four years ago.
A hello kitty backpack. Bought it as a birthday gift for a friend's daughter, we had a fallout and I kept it. One day I needed a clean backpack and this was on hand so I grabbed it in a whim and have been using it ever since.
I have a pair of Columbia, silver ridge and tetons laying around but this fluffy cute backpack makes me so happy and has the perfect size.