I've found that if you have authoritative addressing data for your target market(s), a search/autocomplete field is a great alternative to the multi-field form being talked about in this discussion. Having access to that sort of data is, of course, a pretty big caveat as much of it is currently proprietary but efforts are being made globally to address (couldn't resist!) this (e.g. http://openaddresses.io, http://alpha.openaddressesuk.org).
