Both of my machines are running GeForce GRD 565.90/ICUE 5.19.104 and have multiple ICUE supported devices without the high CPU usage you and others are reporting. No idea why your machine would see this problem but neither of mine suffer??
Rig 1: ASUS GPU, ASUS motherboard, Commander Pro, 2 x Lighting Node Pro's (9 x ML-120 RGB Pro fans), AX-1600i PSU, Dominator Platinum Pro RAM, K95 RGB Platinum keyboard and Nightsword RGB mouse.
Rig 2: Commander Pro, 2 x Lighting Node Pro's (9 x ML-120 RGB Pro fans), AX-1200i PSU, Vengeance RGB Pro RAM, K70 RGB TKL Champion Series keyboard and Nightsword RGB mouse.