The queen brings order to disorder, with her death there was resulting disorder. the whole idea of a "collective" is a work of fiction, the drones are the slaves of the queen, without her direction, the slave likely just wandered about the ship, all but bumping into the walls.
They could have been stunned now, or hyposprayed, and parked in a convenient cargo hold. The recently assimilated Enterprise crew would have been dis-assimilated, and many of the borg who initially board the ship as well.
In the 22nd century, Earth likely would have been out of "range" of any other borg queens located in the delta quadrant.