The greetings and "special treatments" are really crew dependent. My recent JFK-HKG in J (as a GO), none of the FA/SP addressed me by my lastname when serving drinks/food or when I requested anything. Of course, I got the lastname greeting from the ISM but that is sort of expected in J, regardless of status. On my prior flight into JFK from HKG via YVR, I flew in Y and the SP actually came and thanked me for flying CX and all that sweet talk. Then again, she's probably YVR based but on this trip the FA's in Y was actually better than those in J!