Ctrl+G should be bound to Move to Collection > New Collection, not Create New Collection - User Feedback - Blender Developer Talk
Iyad Ahmed on Twitter: "Blender Daily Tip No.29: Hide node groups from Add > Group menu did you know, you can hide node groups (or most data blocks in .blend file) by
Group = ctrl+g - Modeling - Blender Artists Community
Prevent certain node groups from being included in the Add menu - Blender Stack Exchange
Shortcut Keys for Blender – Blender Knowledgebase
Change ctrl+g to do something the average user would find useful. — Right-Click Select