If you are like me, and you only want to disable annoyances with quotation autocompletion, and continue having braces autocomplete, you may be in luck!
I just installed this plugin here to fix the usability issues:
https://marketplace.visualstudio.com/items?itemName=MadsKristensen.QuoteCompletionFix
This fixed my issues with quote autocompletion in code files from what I can tell so far - but the issue still persists in plain text files. But I don't care about quote or brace autocompletion in text files, so I just disabled it entirely for only that file type by turning off the option located in the Visual Studio UI at:
Toolbar -> Tools -> Options -> Text Editor -> Plain Text -> General -> Automatic Brace Completion
Many thanks to Mads Kristensen for this highly useful extension!