HideShow Comments

 
Comments are good, but they can make code hard to read.
This extension replaces comments with a callout icon.
Comments can be shown by hovering over the icon (Tooltip)

or by clicking on them to edit:

You can selectively hide or show comments using the toolbar:

Hide Singleline Comments,          `ctrl //` (numpad)
Hide Multiline Comments,            `ctrl /*` (numpad)
Hide Documentation Comments, `ctrl **` (numpad)
Hide All Comments,                       `shift ctrl -` (numpad)

You can change the shortcuts in Tools/Options/Environment/Keyboard

There are some options to tweak the behavior of the extension:

Works only for C#.

If you are using Visual Studio 2015 or newer you can use the new version of the extension.

Feedback is welcome.

Version History:

2.1.2
  Fixed bug which caused visual glitches and crash

2.1
  Hide collapsed comments too (ctrl-m-o)
  Prevent viewport from jumping around when hiding/showing comments
  Fixed incompatibility with other extensions
  Improved editing experience

2.0
  Added Toolbar
  Bug fixes
  Improved editing experience
  Performance improvements

1.2
  Bug fixes
  Added options

1.0
  Initial version

Disclaimer:

You use this extension at your own risk. It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.