I actually think "the nerf" was more aimed at the regular players and trying to get them into dungeons (or at least make it more of an option) sooner. With the dropping of mobs in the dungeons it makes the runs faster in LFD and brings them more in line with WotLK dungeons speed wise.
I think multiboxing boosting was just a casualty of the change.
I personally am considering starting a full new team on a new server and leveling them with just heirlooms, by all accounts leveling is now VERY fast even without RAF.