New Steps to have column names from the Describe Window into the Editor Window:
- From the Editor Window, highlight the table and then hit F4 (to describe the object)
- Drag the column name to the right location (between SELECT and FROM )
- Also Control key can be used to select multiple columns and drag them to the Editor window.
See image below for more detail:

The option to double click on the column name from the Describe Window will be available again in the next Beta release.