That depends a lot on where you live. In Austria, for example, where I lived for several years, academic titles carry a strong social cachet and are used absolutely everywhere - on your credit card, bills from the city council for cleaning out your bins etc. People with more than one PhD will be addressed as Dr Dr Firstname Surname, someone with a regular engineering degree is allowed to refer to themselves as Ing. Surname instead of Herr/Frau. It's a really big deal.