As for the rest...who turns off their computer these days...seriously?
Seriously? Me... and quite possibly a lot of people in the world who care about pointless and needless consumption of power. Jeez, talk about conspicuous consumption from the American contingent...! (unless you guys run from renewables, in which case I take it all back. I'm planning to fit solar panels eventually).
I turn my Macpro off when it isn't doing anything- any time I will be away from it longer than half an hour or so. Overnight? Absolutely. Off at the wall. (I know it sometimes needs to run scheduled jobs in the early hours, but it gets to stay up all night encoding video once or twice a month, which is plenty often enough for it to run these cleanups). Lunchtime? Possibly , unless I'm coming right back to work on it. Going out of the house? Yes, definitely. I can't be using the computer when I am not sitting in front of it, so why waste power having it running?
And my Macbook Pro with SSD is so fast to reboot that I can see no reason not to power it off when I've stopped using it. The less power it uses, the better, although I'm sure the drain on standby is minimal compared with (say) needlessly leaving the Macpro running overnight.