Boxing is still going to be faster than non-boxing.

Take prospecting your ore.
If you have 200 stacks of our, a full 5-box group will prospect that in the time that a solo boxer would prospect 40 stacks.

You can do the whole spectrum of skills.
A couple of Scribes to make glyphs and/or decks.
A leatherworker, blacksmith, enchanter, etc...

Really, you'd only need one at maximum level...
Although multiples is faster acquisition of recipes, if its like Jewelcrafting in WotLK...
Or quicker prospecting...

You only need to stack something, if you want multiple transmutes or whatever.