The very useful feauture "Find usages" exists in Visual Studio and Resharper, but I can't find the same in Unity3D Editor. I see only "Select dependencies" in Unity3d, but I need the opposite one. Does it exist?
From the Editor, go to the Project Tab, select the given Asset, right-click on it and then click Find References In Scene. It will show you every GameObject that the given Asset is attached to in the Hierarchy View if the given Asset is a script. If it is an image, audio file, or a prefab, it will show you which GameObject is using that Asset in the Hierarchy View.