FWIW Fahrenheit has more precision for the temperatures you most commonly feel. Day-to-day you're likely to feel temps between 10-32°C (range of 22°), which is 50-90°F (range of 40°). It might not seem like a big deal, but I can tell a difference in my house when setting my thermostat from 68°F to 69°F; conversely, if I turn my thermostat to C mode both values get rounded to 20.

But yes, as an American, I think of CPU temps in terms of C, I know water freezes at 0°C/32°F, I know water boils at 100°C but have never committed to memory what it is in F, and in chem classes we always use C/K.