I would actually say the opposite is true - an ILS requires much less capacity and concentration to fly. It's all laid out in front of you - all you have to do is chase the needles (not that I would do that of course - I would use the correct techniques as taught to me during training!!). With a PAR you have to listen to the controller, interpret their instructions, translate them into actions, and guess at exactly what rate you were closing on the GS / centreline. I suppose an ILS is a bit trickier in an ac without a flt director, but it's been a long time since I've flown one. Do any FJs have them?
16B