As a Canucker born in the late 70's I am extremely comfortable with centigrade.
< 0C = Freezing
22-25C = Nice warm weather
> 30C = "FRACK OFF WITH THE SCORCHING MELTINESS!!!"
< -20C = "Cold as pizzwizz"
< -30C = "You gonna die iffen you stay out here too long"
My apartment has a digital thermostat for some dumb reason reads in Farenheit (I think maybe they anticipated really old people to live here or maybe the old woman who lived here before figured out how to set it to Farenheit).
Being the uneducated dimbledorfer I am it totally messed me up because all I knew was that when I visited Florida as a kid it reach 100F and it was EXCRUTIATINGLY hot! After about a year I figured out where my current comfort zone is in Farenheit (due to my soft tissue/joint problems it's between 76F and 82F otherwise my body seizes up or I'm sweating my blapples off) but had no idea how that translated into Celsius unless I did an online conversion.
During the first heatwave this summer I figured I'd better learn how to make the conversion so I could compare the local weather reports (which default to Celsius of course) and try to manage the temp in the apartment (no AC, only windows and fans and I needed to know when it was hotter OUTSIDE than inside so I could close up my windows and trap in cool air for as long as I could).
Turns out it's pretty darned easy for a quick approximate conversion.
F to C
(F - 30) / 2 = C (Farenheit minus 30 divided by 2 equals Celsius)
Reverse the equation for C to F.
It's not exact (because there are fractions/decimals in the TRUE coversion equation) but it's accurate within 1 degree for normal outside/inside temperature ranges and can be easily done in ones head for crust craniums like me.
For body height and weight I much prefer imperial* (I could not tell you how tall I am in meters or how heavy I am in kilos). Distance in miles vs. kilometers screwed me up for a while (I think they were still transitioning road signs when I was growing up) but I'm generally okay with km's now. Everything else I'm totally okay in metric and generally prefer it.
*The English "Stones" thing excepted which I think is just dumb and unnecessary. Tonnes vs. Tons is another annoying one.
Metric though is of course much better for scientists and other such eggheads so it's got my support. If it makes it easier for them to do their magic and make the world better go for it.
Oh... I forgot about construction stuff (I was a contractor for a while). When measuring/cutting/purchasing materials it's always much easier in imperial "inches" and "feet" because a) the standard material lengths/areas are imperial and b) working in centimeters means much higher numbers to work with and it takes much more of them to reach a meter as opposed to a "foot" (so in imperial you get a smaller/more manageable "large" unit/distance). I've never worked in "yards" though. That seems only useful for American football fields. lulz...
As far as the "Political Correctness" of math?
well I ain't gonna go there...