In an article about how infants think before they learn words, Lisa Oakes, a developmental researcher at UC Davis Center for the Mind and Brain, stated, “Categorization is what the mind does. To learn categories is the fundamental way that the mind deals with too much information.”
That said, how much time did you spend thinking about and planning for the information architecture (i.e. categorization) of your website or application?
Good categorization (based on your specific target audience and how they think), lessens the “mental energy” needed to navigate your site, making it easier to use and creating a more enjoyable experience.