We become comfortable with the vast amounts of information that we routinely work with. It is a baffling universe to most people. It becomes second nature to us, once we have worked with a collection for a long time. At this point, we have wisdom and knowledge about the collections we interact with. It took a very long time for me to learn to listen to what exactly a patron was asking for and providing that, not what I thought the patron wanted.
Libraries are, indeed, information centres.
But more than that, they are catalysts to knowledge and ultimately wisdom.