My answer to this is based on asking myself:. What have I only recently gotten that I now use very often?
To be fair, each of these three things that I'm about to mention I've had for at least three or four years. But that's still recent in terms of my overall work experience.
1:. A flip driver in a dedicated cordless drill.
https://www.acehardware.com/departments ... ts/2100527
By far the majority of the time I use a cordless drill to either drill a 1/8 in hole, or screw in a Phillips head screw. With the flip driver installed I can do either of those things instantly.
2. A really big, at least 18 in, adjustable wrench
A while back I bought an 18 in adjustable wrench from harbor freight. Since then I've gone back and bought a 24 in as well. I almost never use them to turn nuts. But they're big enough and strong enough and provide enough leverage that you can bend and twist fairly heavy steel with them up to like a quarter inch plate. Or half inch rebar. And there's just a lot of times that you need to twist and tweak something made of metal and one of those big wrenches is perfect for the job! And the hole in the handle is great for bending rods as well. Just slip the hole over the rod and use the leverage of the tool to apply a bend. I find myself reaching for that big wrench all the time.
3. A bench mounted porta-band saw

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I first saw this tool hack done by Jimmy DiResta. He took a Milwaukee portaband saw and mounted it into a stand so that you can use it as a stationary tool. I did the same thing with the harbor freight version of Saw, just because it was so much more affordable. Fast forward about 8 or 9 years, and I'm still using that harbor freight small band saw. My best estimate literally speaking, is that I use it an average of four times every time I enter the shop. Hundreds and hundreds and hundreds of times. Often it's for cutting metal. Copper, brass, aluminum, iron, steel. Pipe, conduit, tubing, all-thread, shafting, rebar, plate as thick as 1" or as thin as sheet metal.
But not only metal. If you need to quickly cut a little chunk of 2x4 or plywood or PVC, or... Anything except glass or tile, just throw it on the bandsaw. Way faster than getting out any other cutting tools.
Once this cheap harbor freight saw dies, I'll have to spend whatever it takes to get some other similar saw, and bench mount it like this one is. I can't live without it now
Bob