Do helicopters fly holding patterns under IFR? If a helicopter is flying an IFR flight plan, and the airspace around the destination is busy, will controllers tell them to fly holding patterns just like planes do? Or will they hover at the holding fix? Or something else entirely?
In short, yes, helicopters fly procedure turns, hold, etc. just like airplanes.

Hovering at a fix is not practical, as they do not really have the nav capability to perform that, and it is contrary to normal ATC procedures.