This is the worst we have seen it - and we really didn't see it, we smelled it on VG on the stretch of road to the North Sound near the desalinization plant.
We went to Savannah daily and there was no seaweed.. We also sailed to Anegada and around the Dogs to Road Town, again - no seaweed. We did see clumps of it here and there but didn't give it a second thought.
Beside that strech on the North Sound Road, which is pretty offensive, I was unaware of the extent of the problem until I read it here.