In more complex class design it is quite common to have lots of pure virtual functions here and there, and you need to quickly navigate between their implementors.
Currently we only have navigation with alt+G between function declaration and implementation. I think that alt+G should show up known implementors of a pure virtual function. That information should be available from parser, since when I rename pure virtual function it also renames it in subclases.
Another feature request is to allow rename of pure virtual functions if one starts renaming it in subclass, and not the top class. Currently all functions will only be renamed if we rename it from the top class.
It's unlikely that we would implement Alt+G to support that. For now, Find References is the tool to use. Currently, Find References will descend into implementers but it will not ascend into base classes; so you need to run Find Refs at the top-most declaration (same behavior you noted for Rename). case=3346 is being considered to change that behavior.