Hi David,
workspace file (.wsd) was needed in KSDK 1.3 to import library project together with application project. In KSDK 2.0, the situation is simplified and library project is not more needed, so you can import directly Eclipse project using File - Import - General - Exising Projects into Workspace - Select root directory - Select project(s). Before importing ensure "Copy projects into workspace" option is unchecked.
There is also built-in New Project Wizard in KDS allowing to create new projects or clone existing SDK examples (create stand-alone project from SDK example). Just run File - New - Kinetis SDK 2.x Project. Before first usage, just ensure you have the latest version of the wizrd from KDS update site - using Help - Check For Updates.
Regards
Marek