Excactly. Theres so many different reasons why people multibox.

I do agree that it's very easy to get into heroics/normal instances now with the dungeon system. In one way I think its sad - because now I can stay in dalaran and never leave and still go into instances etc.
The good part is, I can now get a lot more instance running instead of having to fly to the instance I want to do.....

Even though I meet a lot of different people in the random dungeons, we still barely chat. It's often only a hello and then we go straight at it.