Similarly, ever tried to find your bud's house the first time in a subdivision, esp. at night? Those places all look the same and you drive past 4 times before you figure out one of the house's numbers and deduce it. The pizza guy the other night thanked me for having my number clearly displayed and lit, for the same reason.
Of course once you get into a building, it still remains annoying - I mean it's still not really obvious how the internal room/suite numbering works. That portion of addressing is totally up to the architect, and a lot of times is only intuitive after you know the space you're in (if ever).