Strad had some pretty nifty tools for measuring things like wood thickness, and they probably worked about as well as the ones I use. Power tools do make things go faster, of course, but where I have a bandsaw, he had apprentices. The Hills, in their biography, figured out that Strasd built about two violins or violas, or one 'cello, per month. I'm not sure I could work and faster or more precisely.
Of course, modern tooling really comes into it's own in making production instruments. Bob Taylor, of Taylor guitars, told us at a luthier's meeting once that the Indonesian factories produced a guitar with only 1-1/2 man-hours of labor. Virtually everytning is done by machine, with the people basically only there to move things from one machine to the next. In that realm we're rapidly moving toward the fully automated factory where the only living things are a man and a dog. The man is there to hold the dog's leash, and the dog is there to bite the man if he touches anything.
As I said in my last post, the problem with production insteruments is that there is no way (as yet) that factories can adapt to the variation in wood. People who have not done or seen the measurements can be surprised by the degree of variation between pieces of ostensiblly 'identical' pieces of wood. This is especially critical in making Classical guitars, where treble response is particularly necessary. To get good trebles you have to use a 'good' top, work it to the 'best' thickness, and brace it 'right'. What's 'good', 'best' or 'right' for one piece of wood may not be for another similar piece. Dealing with this sort of variation takes time, and time is the most expensive input in a factory. We luthiers can take the time. That's why you see very few (if any) top notch Classical players using anything other than a hand made guitar. Steel strting guitars can be mass produced to professionally acceptible tone standards, but not Classicals.
That said, there are some individual luthiers who use computer controlled machinery to produce parts for their guitars. Things like necks, that take some time to carve, and are supposed to be pretty uniform in size and shape, can be made quickly by machine while the luthier does something else. There is some controversy about this in the lutherie community. Properly used it should make no real difference in the quality of the guitars, but, of course, it may be hard for the customer to tell whether the use has actually been 'proper'. Then again: "A difference that makes no difference is not a difference". At the moment, at least, it's possible to get instruments made entirely by hand, ones made almost entirely by machine, and everything in between. Take your pick.