You can quickly point miniDBA at any SQL Server instance to enable you to identify why T-SQL you are dependant on is running slowly. Regardless of the language you develop code in, there comes a time when the database slows you down and you rely on an administrator to help you solve the problem. With miniDBA you don't need to wait for them to become available and spend time helping you.
In development environments that include local, development, UAT, and virtual servers, the ability to connect to any of these without worrying about the time and expense of software setup or licensing puts you ahead.