I am just curious what your most used tool is (homemade or not.)?
I have a 2000# walkie style forklift that I picked up on craigslist a few years ago. I use this thing all the time and it really makes working on large heavy things much easier. I have made a motorcycle lift attachment and I have a pallet with plywood that I use as an adjustable workbench. Last night I was using it to separate a engine transmission out of a subframe that I previously removed from a parts car. Also using the forklift to remove the sub frame with suspension and engine/transmission was a pretty easy task. I use the forklift so much that I am considering upgrading to a larger regular forklift. I am also planning on salvaging and old forklift mast to attach via 3 point to my tractor for use outdoors.
Other than that the torch and welder get a lot of use in my shop to make or modify other tools.
Outside the shop, my old green tractor with some of the implements that I made have been getting quite the workout. I have probably pulled up 500 scrubby trees that range from 1" x 6' tall to 6" x 30' tall with the jaws on my tractor. The boom pole has also been doing some heavy lifting in moving large trees that I cut down.
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