In Excel we can input data in rows, using Tab to move the cursor along the row. When pressing Enter, the program assumes you are going to input another row and moves the cursor to the first column of the second row.

In Gnumeric to achieve a similar behaviour I have to drag a rectangle with the mouse, then use Tab key to move along the rows, but this method usually has the inconvenience that I have to count or estimate how many columns I'm going to fill.

I think it is more user-friendly the way Excel works.