Can you turn off Peek Definition in Visual Studio 2013 and up?
In the latest version of Visual Studio 2017 (15.4.0) it is:
Tools→Options→Text Editor→General→Enable mouse click to perform Go to Definition
You can either disable it by unchecking the box, or set a different key to trigger the mode.
If you have Resharper AND Productivity Power Tools, by default this will cause ctrl + click
to go to definition AND peek the definition. Very annoying. The solution from @SnowFatal will turn off the peek functionality. Resharper's option is listed as "Go to Declaration on <Control + Left Click> in the editor".
In pre 2017 Visual Studio:
Tools→Options→Productivity Power Tools→Other Extensions→Control click shows definitions in Peek
Adam Garner pointed out that in Visual Studio 2017, the location is:
Tools→Options→Text Editor→General→Enable mouse click to perform Go to Definition
Ctrl + Click -> Peek Definition is actually enabled by Productivity Power Tools. If you disable "Ctrl + Click Go To Definition" in Productivity Power Tools options then this behaviour will disappear.