I've tried the Brian Kopp guide and Extreme Leveling.
In both cases, the one-box speed is amazing.
And the five-box speed sucks with the collections.

Both of them use an in-game addon, to mark where to go on the mini-map.
A tad better then questhelper, in that you don't just have a straight line to the goal and possibly mountains in the way.
Well, once we're in Outland, we should be flying anyway, so that's less of an issue then in the old world.

The guides assume, a few collections with even a poor drop rate is ok.
Because the experience is decent on the kills, and you get a reward from it too.
Those portions are kind of bleh, for boxing.
But the pace is pretty good with any of the guides.