devenv.exe /SafeMode and add-ins in Visual Studio 2005 / 2008
Just a curious difference in behavior between Visual Studio 2005 and Visual Studio 2008 that the MSDN documentation doesn't cover very well:
According to the MSDN documentation of VS 2005, "This switch prevents all third-party VSPackages from loading when Visual Studio starts, thus ensuring stable execution." One would expect that if third-party VSPackages are not loaded, add-ins would be also excluded from loading, but they aren't, they are loaded.
Visual Studio 2008 works as expected and the whole Add-in Manager is disabled.