The viz has been kinda average in Port Sanilac the last few weekends and what you say here is too true. I descended on a wreck I dive pretty regularly and had no idea where I was - I didn't really recognise any of the features within the 3' radius of my field of vision. The turbid conditions make you pay a lot more attention to the details and I saw lots of things I had not noticed before.NO VIS makes familiar dive sites fun again!
I personally love the way you actually loose your way at times and rely on the compass!