I did it for a while.
Setup was a 85 Arms Warrior with Lazyraider (iirc) and LeaderPlugin (played this myself) and a 85 Resto Shaman running Partybot, set up for healing.
It worked quite well about 60% of the time. The whole thing would sometimes bug out and cause the shaman to just follow me around without healing. Both chars were really good geared for the time though.
I think with all bugs fixed I could have hit 1800, mainly because the ShamWoW resto shaman cc is so excellent.
Nothing comes close to this CC imo.