In the Workast web app, your taskbar on the left side of the screen has some automatically populated saved searches.
Clicking on the "Assigned to me" tab will open the saved search, showing all tasks, including subtasks, that are assigned to you.
The saved searches are automatically updated with all tasks with the set filters, so you'll always have up to date information. You can filter the results by space (ascending or descending) or by the due date by clicking on the column headings. To learn more about saved searches, click here.