Web.config and App.config have can have many different configuration options but it is difficult to remember what some of the less commonly used options are. This article provides a schema definition for .NET configuration files such as Web.config and App.config. The schema makes Visual Studio .NET help you out by displaying intellisense when working in these files.
[ Get Intellisense for Web.config and App.config in Visual Studio .NET ]
The one caveat of removing the xmlns just before saving is a small price to pay. What I don't understand is if it is this easy, why wouldn't the architects of VS.NET have put this in but with a bit more finesse?
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Disclaimer The opinions expressed herein are my own personal opinions.