It’s not what you would call a basic tool, but I have a mechanical screwdriver. It’s more or less my favorite tool.
The Spec Tools Overdriver is like a ratchet screwdriver’s smarter sister. It will work like a regular ratchet screwdriver, But it has this knob on the shaft: if you hold that knob and twist the handle, the bit turns 4 times as fast. Which makes inserting and removing fasteners go very quickly, and is just the thing for starting screws in wood: The point of the screw spins fast enough to start drilling its own pilot hole until the screw starts to actually bite, then you let go of the knob and drive the screw in. (If you twist the knob and the handle in opposite directions it spins even faster.) Its ratchet mechanism is very smooth and has no steps that I can feel; if you can turn your hand a tiny fraction of a degree back and forth, you will (eventually) be able to get the job done.
I love this tool.
The one I linked to up there seems to be on the way out. It’s on sale, and not shown on the main shopping page. The one that is shown on the main page has a new handle design that looks to be even more comfortable (the cap on the bit storage compartment at the butt of mine makes leaning on it for more leverage a little uncomfortable: the new one seems to have a rotating butt cap to make it more comfortable than a standard screwdriver, rather than less. And the shape of the handle is more ergonomic.)
Nothing is perfect: I have often wished for a “no spin” setting (you can set it to ratchet clockwise or counter-clockwise, but you can’t set it not to ratchet at all), and the ratchet direction setting ring is easy to switch on the fly (which is good); so easy that sometimes I slip it while working the screwdriver, especially when holding the overdrive knob (which is not good). But all in all, I would be a very sad panda if I didn’t have my Overdriver.