It is impressive how this game can have such an effect on someone and give them that urge to play it. I had played the game until the beginning of Sen's Fortress then I decided to give it a break for whatever reason I don't remember, I think it was when FFXIII-2 was released, anyway.
This week a friend of who isn't much of a fan of RPGs was looking around for some games at a lower price and he found Deus Ex and Dark Souls, I told him they were both great and anyone would be a good decision. After that that Dark Souls bell (of awakening) started ringing into my head again and soon enough all I could think about when I had spare time was the game.
I put it back in my PS3 and as soon as I realize I can't stop playing it again. I'm even considering getting the PC version for the new stage.
I'm a big survival horror fan and I believe this game fulfills my needs for that tension more than any survival horror release this gen.