The Draft Workbench, although it adopts ways of working inherited from the traditional 2D CAD world, is not limited at all to the 2D realm.
In any case, FreeCAD features a more traditional workbench, with tools found in most 2D CAD applications: The Draft Workbench. Or you already know something about design, or you prefer to draw things before building them. You might be interested by FreeCAD because you already have some technical drawing experience, for example with software like AutoCAD.