To be fair, our freeway / highway time on the bike has been minimal as we're between road trips. So my observations are based on urban riding at urban riding speeds with stops at traffic lights and sitting in traffic on the afternoon commute home.

I have no doubt that when crusing along at freeway speeds it's far less noticeable. But by design, radiators draw heat out of coolant and that heat has to go somewhere.

Again, it was an unexpected discovery having been away from water cooled motorcycles for the past 7 years. My BMW oil heads and the air cooled Harleys definitely generate a bunch of heat as well, such is the nature of machines with large displacement engines.