For tasks where the sum of the knowledge required to perform the task can be contained in a single brain, such as the map of London, or the multiplication tables, then they've got a point - technological assistance can hamper your learning by making it too easy.

For something like yours or my job, where some part of proper work requires doing common and uncommon tasks and accessing information stores that could not reasonably be expected to fit in one brain, then tech's not harming us, it's keeping us employed. Sure, I've got Dewey, but Dewey only works for one part of the collection. The OPAC is really how we keep things organized and find anything in the library.