The Describe Companion is an easy to use tool to have a quick look at your tables and views - it lists the table or view columns, including datatype descriptions, NULL-ability, defaults and Primary Key columns.
You can drag any columns from the list and drop them in any code editor. You can select multiple items using CTRL and if you drag multiple columns, "," will be inserted between the column names and "new-lines" will be added to the editors - this setting can be changed from the Preferences.
You can press CTRL+SHIFT+D in any code editor to display the table under the cursor in the editor. This is a very fast way to display all columns in a table without having to reach for the mouse.
The Describe Companion