I find it so impersonal.
Once apon a time, people responded to the poster by their name, and when referring to them on their own thread, they would say 'but pavlov said she did/did not...yada yada'. OR, more personally 'pavlov, i agree/disagree with what you said about...'.
Now it is 'the OP said' or 'OP i agree/disagree with you' why? why not just put their name, you are talking to a person.
I personally really dislike being referred to as 'OP'.
AIBU? i dont think so