If you know the task name, you can search for it using the magnifying glass at the top right of the interface. It'll show up under "Personal projects" like Kurt said, but it doesn't require you to switch back to the old interface.
I agree this widget still needs a lot of work. I liked having the personal task have all the features of a project task so I could add them to my priority, add notes and tag people for feedback. I used personal tasks for admin related task that were attached to a project or need hours logged.