Why should I use Visual Studio 2010 over SSMS for my database development?

Visual Studio 2010 introduces database projects and a whole array of related features that supposedly facilitate database development. I've used SQL Server Management Studio (SSMS) for many years to do my database development without issue. - Why should I bother with VS2010 when SSMS works for me? What, specifically, does it do better than SSMS? - But perhaps my premise is incorrect and SSMS still trumps VS for database development. If so, in what specific ways is that true?