Unfortunately CEE 7/7 plugs are not that common, newer molded appliance plugs are indeed usually 7/7, but extension leads, plug strips and most important rewirable plugs usually aren't.
I guess in order to see a serious need for polarization one has to have grown up in a country with polarized plugs... the only situation where I ever thought a polarized plug might be helpful was people digging around with knives in toasters, tripping the RCD in the process (only single pole switch and plugged in switching the neutral).
