I use it extensively when travelling outside my home country, i.e., where data roaming charges are insanely high. I also use it when travelling in my home country when far from major urban centres (hey, Canada is huge, man, even Ontario is huge - get too far north of the Windsor-Quebec corridor and forget about coverage).

To me, offline maps were a huge win for Google Maps, and "OK Maps" or some other weirdness is a usability nightmare.

-1, Google, -1.