Not just any undead, in order for greater turning to have any meaningful effect on play the undead must be:
Turnable, for by the time the ability is gained an increasing number of undead have to many hit dice and turn resistance to be turned.
Not destroyable, for the weakest undead can already be destroyed without the aid of this ability.
Capable of flight and dangerous return, many undead when turned, are either bashed to death without resistance while cowering in a corner, or simply removed from combat and never thought of again by the DM.
Finally, it must not be the first encounter that meets these criteria in the day, for any cleric with the Sun domain may use greater turning 1PD.
I would expect all told, the median number of times per campaign an RSoP's greater turning ability is actually relevent is zero.