INT @50, 7-8 Attunement slots filled with 10 Crystal Soulmasses, as many (Crystal) Soulspears you have and Power Within. Grass Shield and TCC as weapons, Crown on the head, light armor (I use the crimson set +5 and the Painted World Guard Gloves +5) and bellowing dragoncrest as Ring. Cast PW before entering the bossgate. After entering the gate cast a soulmass if you have the time, otherwise kite & spam crystal souls spears and when they are out, continue with soulspears. If dodging is required (Artorias) be sure to have Dark Wood Grain Ring on (if you've enough endurance for it). Don't forget to heal when the boss is down, PW continues to run.
Iron golem took me less than 20 sec on NG+, 15 sec for Ornstein, about the same for Smogh, less than 20 sec for seath (including destroying the healpost), about 30 sec for Artorias and less than a minute for Manus. The only exception to this routine was the Capra Demon, Strong Magic Shield, 1SM + 2CSP did the trick without even moving away from the door, just evading the initial blow.
For travelling the world:
No PW instead more (Crystal) Soulmasses plus Ring of Fog in addition to Bellowing and use Logans Catalyst. Just keep the soulmasses up (may need 30 from one bonfire to the next) and soulspear enemies in the far or from behind. Did Anor Londo and the whole Duke Archives without dying once (granted, by now I know where every enemy is, which helps a lot too ).
This is pretty much brain-off breezing through, I don't have the quickest reaction and I don't think I'm a particular skilled player -the sorcerer is just OP. NG was far more difficult for lack of enough soulspears, equippment and attunement slots, I had quite some troubles from time to time, especially with O&S. But NG+ after I've freed Logan from Seth's became almost too easy, the damage output on a crystal soulspeer with PW, TCC, Crown and Bellowing is just insane - and you have 4 of them after Seath in NG+ and 8 SS (with TCC). The only common enemies that survive longer than 2 seconds are the Snakes from Seth's and Dukes if they come up front at you (being good kids they always keep their shield up;)).
Hope that helps everyone who has troubles with his sorc, I don't think there's an easier way to play DS