What control inputs are required to perform a "turning-while-in-flight" maneuver in a helicopter?
Yes it's cyclic inputs only for banked turns because there is no adverse yaw due to ailerons to compensate for.  You will be working the pedals to keep the ball centered, but this is only in reaction to torque changes from increases in rotor pitch and power demands.
Note that the airplane isn't using rudder to turn either; only to correct for adverse yaw.  What brings the nose around in the turn is the vertical fin.  The banked wings creates a lateral force vector, moving the airplane sideways as it goes forward.  The sideway motion cause the airstream to strike the vertical fin from the side, and the airplane's inherent weathervaning tendency brings the nose around to keep it aligned with the arc of a turn.  If an airplane had no adverse yaw at all, you would not need to use any rudder to help with turns.
A helicopter is the same.  There is a small fin back there that gives it modest weathervaning tendency (the disk area of the tail rotor also contributes).  The pedals are just there to change tail rotor pitch to adjust for off-axis yawing motions induced by torque changes (which can be in either direction, depending on whether torque is going up or down); just as on the airplane the pedals are just there to compensate for adverse yaw due to aileron displacement. If the helicopter had some automated system to always compensate for torque changes, you would not need to touch the pedals to turn.
In practical terms, in both cases, when flying you simply do whatever you have to do with your feet to keep the skid ball centered; in the airplane you are generally reacting to aileron movements, and in the helicopter to torque/pitch changes.  The power plane pilot learning helicopters has to adjust to get out of the habit of squeezing a little into-turn rudder to anticipate adverse yaw, and has to instead anticipate the subtle yaw changes - in either direction - from the power and pitch changes the pilot may input during the turn.