Are block heaters still needed for newer cars?

I would think that if the outside temps in the dead of winter were below zero, on a regular basis, an engine heater, or oil heater, might be a worthwhile investment, remember though, the engine may be warm, but I would take it easy on the trans for a couple of miles, up in northern NY, temps are getting down in the -20 and colder ranges, seems that some sort of heater might be a good idea, remember, with diesel you gotta have it no matter, I know a few who love in the colder winter weather, to be honedt, they've never mentioned it. I can see also with the newer tecnology with fuel sytems and better viscosity oils, maybe you don't really need to have one, I don't know if the dealer offers them anymore with gas engined cars.