It replaced my date-filling workflow, and I'm not going back.

Excel 2007's new table feature eliminates the need to copy formulas; once you define a data range as a table, Excel will do it for you! Tables are new to Excel 2007 ...

When you're setting up a Microsoft Excel spreadsheet that contains date information, you'll speed your task if you let Excel do the tedious work of filling in columns of individual date entries.