Haha, yes, you have to repair your armor in WvW. It's really best to think of WvW as the intersection of PvE and PvP. You can do dynamic events out there and get XP without ever encountering a human player.
Also it's incentive to stay alive longer
You don't have to repair armor in sPvP.
I figured, but I'm sensitive about epileptics so I edited to link it.
It's no problem, you didn't have to do that. I'm not photosensitive anyway. I feel bad now.