Visual Studio's debugger still smokes anything I've used since. You could literally drag the program counter to the point you wanted, rewrite your code, and start stepping through it again.
That, and the ability to double click on a damned button and see what it did... What a golden era.
Only the dotNet based VB.Net is available in Visual Studio since 2002, with the Visual Studio .Net which was completely rewritten since the 1998's Visual Studio 6.