I have 3 , Milwaukee 18V impact driver, Mafell Rail Saw ,and a Japanese Pull Saw. How on earth me dad built things with hand drills and a Yankee screwdriver I will never know!!
I wish I had a circular saw when I built the interior of my Transit. Luckily, for the new van (when we find one) my brother in law has a carpentry workshop - add to the list of new tools that I never knew existed.
Battery electric drill/screw driver - putting a couple of back/side gates together with a screw driver for several hundred screws would have taken forever.
Not the same but, the tool I wish I still had is the "Stazput" 18" metal ruler with a thin cork backing on it to stop it moving about, and to stop it picking up ink in draughting mode. Shame the guy in Graham's drove a forklift over it ... The "why didn't I get this sooner" tool is a petrol driven post hole digger. Suffered the manual auger for years. Always made me think of Arnie in that scene in "Conan the Barbarian".
DA sander for me. Or A router is a pretty good replacement for a massive stack of moulding planes and better too as an idiot like me can make perfect things.
This little Halfords quarter inch drive almost pocket sized socket set is used on just about everything i do either in the house or garage , normally £35 , but seems to always be on sale at £28. Mine is laid out slightly different to the picture and the picture actually has more items than mine . Well worth the money and highly recommend
Definitely the electric finger file too! Along with the Mikwaukee impact wrench and vehicle scissor lift!
Used to fit all my tools in a bass. Now I have a lwb transit and still can't fit everything in it - all of them can be classed as not being able to live without