Almost to a comedic extent, Planner does copy a lot of the touches that Things has. For example, dragging the plus icon in the corner to a folder will create a new task there, much like Things. Each section of checkboxes also gets a tiny status indicator, and everything in it is drag-and-droppable. I understand your skepticism, but this really is a complete ripoff of Things in a glorious way. If nothing else, you can't deny the fact that it's more bang-for-your-buck being free and whatnot.
