This extension simply highlights the #region and #endregion directives. Based on the simple adorner in the Visual Studio 2012 RC SDK.
Known Issue: The extension does not understand code structure so the text "#region" and "#endregion" will be highlighted wherever it appears, even if it is typed in a string (such as string s = "#region directive") or in a comment (such as //This is a comment #region about regions).
Updated to add support for VS2019 courtesy of Nir1812.
Updated to add support for VS2013,2015,2017 courtesy of Denis Peshkov.