My routine is about to change...
First, I found that the engineer elite "mortar" throws ballistic shots, which means it's far easier to stand at a safe place on walls in WvW and shoot at people below without risk of getting hit. I didn't try it in combat yet, but it works really well on a wall even with sides on it.
Second, I completed my daily entirely in WvW yesterday. This is really interesting because it means that even for kill variety, there's enough to get that done in WvW. Had I known that earlier, I would have spent way more time in WvW.