Last night's run into Karazhan proved my point inexplicably. Oh yeah, I started using WoWWebStats too...
It really means the difference between 1st overall or 4th/5th overall dps. Simply switching to BM put me almost 100 dps higher than the next closest Hunter.

Hailen needs some gear upgrades and Shikaku does as well, but 100 dps is 100 dps any way you cut it.
I guess I'm going to be staying BM for a while.