Often times I select a group of objects such as plines, hatching and accidentally press ESC before I finish selecting everything. Or when I select certain cogo points and then use the Elevations From Surface command, and once the command is complete, the cogo points become unselected again; so I would have to reselect those points again if say I wanted to project them to a section view.
Regardless what objects I am selected I think it would be beneficial to create the command RESELECT that when typed in would automatically select the last object or group of objects that was selected. This would be very helpful and the drawing cache would only need to store the memory of the last selected objects, once a new group of objects was selected the previous cache could be wiped and replaced with the most recent selection.