Apples and oranges, man. You absolutely CAN NOT compare the PvE grind to the PvP grind.
The most difficult part of gearing up for end game raiding is putting the group together to do it. Battlemaster gear makes you insta-ready for Hard Mode raiding, so Tionese and Columi can be skipped completely. You can be in full Rakata gear in 2 weeks, or almost full Rakata in a single day if you're lucky with gear drops. The grind from BM to WH takes far longer.
Except that Rakata should be compared to Battlemaster (58 v 58) while War Hero should be compared to Black Hole or Campaign (61 v 61).
I'm willing to bet there are faaar more players with full War Hero than with full Black Hole/Campaign.