I would start simple, with NON-power tools!
Say you're working on a big project, like cabinetry or something, there's nothing simple about only using hand tools. Say you want to cut a perfectly straight line, you can slice a sheet of plywood in about 15 seconds on a table saw, but using a hand saw will take a few minutes and you have to be able to keep it perfectly on the line.
Try driving a screw into wood, if you use a screw driver, it will take a lot longer, and you risk splitting the wood as well as stripping the head of the screw. Even self-tapping screws can still split the wood if you're using a regular screw driver. But if you use a power drill to pre-tap the hole, then swap the drill bit out with a screwdriver bit, you can do 5 minutes worth of work in less than a minute and it will come out better. Even if you don't pre-drill the hole, you can still set the torque setting on the drill to avoid the risk of overtightening.
Try cutting a piece of sheet metal with a hack saw and tell me that's simpler than using a plasma cutter.