There is a particular dropdown in resharper that I have often used for renaming identifiers - I believe it does other things as well depending on context. After I change the name of a variable or something, a small underline appears that expands to a drop down on hover:
I think I recall at one time using a hotkey combination to expand this but I can't remember what it was, and I don't know what the feature is called, so I could find it, or configure it. Does anyone know what this is called? Or the default key combination?