As I understand it, ex cathedra refers to very few proclamations indeed. The Church itself is in a state of confusion over what might constitute ex cathedra edicts. As far as I can make out, the last instance was in 1950 when the Pope declared that the dogma of the assumption of Our Lady had been declared ex cathedra (how bloody ridiculous can you get...). I suspect that papal infallibility is such an uncomfortable issue, even among ardent Catholics, even among popes (John XXIII more or less ridiculed the notion), that it's a red herring, more or less.