>It seems the proper terminology to describe this is known as "Disable real time compilation".
>
>This is described here: http://stackoverflow.com/questions/30203387/how-to-disable-real-time-compilation-in-visual-studio-2015
>
>This is exactly what I have:
>
>1. "It's grinding to a halt whenever I make changes..."
>2. "...ripple effect throughout my dependent code"
>
>This is putting the Visual Studio interface to almost a complete halt whenever I type as it does too much in the background. Then, it doesn't allow me to finish the line and starts complaining about everything. Then, it changes my code. This created severe problems last night on our UAT environment as I did not realize my code got changed since the last two weeks in previous adjustments done elsewhere.
>
>And, worst, the setting is now gone:
>
>"You're right, those options exist in 2013, they're nowhere to be found in 2015."
>
>They might exist, but certainly not in the same place.
>
>So, basically, what are our options here?
>
>Should I do a rollback of the installation to go to 2013, change the text editor or else?

Hmm. The link implies that they problem exists in the C# editor as well - but the post makes no mention of it causing actual changes to the code.
One suggestion that might mitigate the problem: Check 'Automatic brace completion'. That should mean that when you type an 'opening' quote then the 'closing' quote is automatically added - which should immediately prevent the editor perceiving the following code as invalid