This may already be suggested in another idea but be called something different.
Within ArcMap, you have the ability to open ArcCatalog in a new pane. However, within this new ArcCatalog pane, it's is currently not possible to select multiple feature classes/files/rasters/tables and drag them into ArcMap. This would be beneficial for adding multiple orthos, etc. to ArcMap.
A workaround is to use the Add Data button, or open the ArcCatalog application and drag/drop from there.