IMO -
I believe
temperature is THE most important factor right now.
Skinny water gets warmer faster, whether it's a warm SW wind, or just the temperature in general that drives the water temperature up...it's still temperature that drives the fish this early. As the ocean water acclimates, getting closer to the temps in the ponds, the fish start to venture outside the pond. Some make their way back in, others continue to search and eventually the newer fish show. As far as why the WW....simple, it's a nice fishing platform...and as stated above, a LOT of fishermen show up increasing the odds of catching fish as they show up, whether from the ponds or arriving scouts, giving the impression that it's an early hot spot. I'm SURE there are plenty of other spots that produce at the same time, they're just not so exposed or publicized.
As far as the rocks heating the water??? A small stretch of rocks isn't going to affect the ocean like that, maybe a fraction of a degree right up close and tight, but I don't see them warming the water enough to make a difference fishwise.
I think the biggest reason they show up at the wall is for that slim chance of making "Stripers Gone Wild II"....
They're pretty jealous already given the fact that there was a blue-crab showing off her stuff in part I.
OH, and did I mention...it's a point? I heard once that points are fish magnets.