Great list! We've also been blogging about extensions to give folks visibility into new ones to explore, here is one example:

New and Noteworthy Extensions for Visual Studio – April 2016: https://blogs.msdn.microsoft.com/visualstudio/2016/05/02/new...

You can find the other posts and related ones using this tag filter on our official Visual Studio team blog: https://blogs.msdn.microsoft.com/visualstudio/tag/extensions...