I've never heard someone say it. I'm more interested specifically in British English, but also in general.
Et Cetera is used in spoken English quite frequently in certain circles.
I will say however, that at least in the US, I have found people to often mispronounce it as "ect cetra". This is because most people that write it out on paper use the shorthand version, "etc...". I contribute that to the reason people don't know how to pronounce it correctly; or in other words, they don't know how to spell it.