Plodded my way from the first Anor Londo bonfire through to killing Ornstein & Smough today, both as the recipient of help and as a golden phantom. The dragon arrow archer guys were as lame as I remembered, but I'd kind of forgotten what an absolute bastard of a fight O&S is, even if it's frequently exhilarating and well made. From a design perspective I think it's the one that's really meant to make you get on board with using summons ... Even NPC summons help by offtanking, even though Solaire -never- dodges the AoE.
I always get this sort of "Dark Souls Ennui" after finishing O&S because now I have to make choices about where to go instead of just moving forward.