I do all of my flying in economy and will requalify for WP only 3 months into this status year.
Nearly all of my flying is international and when I do fly on CX (about once a month) I get greeted by name about half the time in economy. I often get upgraded on CX to business if economy is full and always then get greeted.
On the ocassions when I've been upgraded to business on Qantas I get greeted about one time in four.
I do get greeted by name at the international first class lounge as I'm through there a couple of times per week.