Fit Page to Artwork Bounds or Selected Art
In Illustrator, there are two very useful features in the OBJECT >> ARTBOARDS menu:
--Fit to Artwork Bounds
--Fit to Selected Art
These automatically adjust the size of the artboard to either the outer boundaries of ALL the artwork on that artboard, or to the outer boundaries of the currently SELECTED artwork.
I use this all the time in Illustrator. To my knowledge there is no equivalent InDesign feature that automatically resizes a PAGE to the artwork on it. This would be very handy