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the higher RPM's do work, because the energy required is divided among more events. The heat is less concentrated, and as stated before the cooling system is running at a better flow for the heat.
I deal with this phenomenon with my Cummins-powered Dodge truck.
It makes huge amounts of torque at 1700, but the heat will build rapidly on a hill. If I get it to 2100 or so in the lower gear everything is cooler.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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