Also pgAdmin is about as feature-ful as Notepad is so it's not hard to do something a little better.
Besides server explorer, VS also has SSDT (SQL Server Data Tools) obviously only for SQL Server, but I've never seen anything even in the same league as SSDT for any open source database.
You don't mention the two things together, but VS has the server explorer which you can use to hook in to a database and do administrative tasks (both design and data viewing)