Some of the refactoring tools have been relocated or are at least accessible in a different manner than they were previously.
Using the extract method refactor as an example, you can still use this function; it is just not done the same as before:
Right click
Quick actions
Click extract Method
I think they’ve changed it to feel more “ReSharper”ey. All of the functionality should still be there however.
Here’s more information on refactoring in Visual Studio 2015 – hopefully this helps! Refactoring (C#)