Just a quick update, given the island flooding issues of 2017...
Was there a couple of times last week, and there is a significant loss of beach in some areas. The south section is fenced off from the southernmost c-o beach entrance because there's basically no beach left.
At the north end, there's still a big "pond" near the clothed/c-o border. It's set back a ways from the water's edge, but it's still lost beach.
In between, there's noticeably less beach than in previous years, thanks to the nigh water levels.
As for water temperature, it's still very cool. Lake Ontario takes forever to warm up under the best of conditions, and these certainly haven't been the best of conditions.
In terms of demographics, still lots of guys, and a mix of ladies, some nude, some topless, some fully attired. There seems to be a higher percentage of males that congregate near the south end; I didn't take any surveys to determine their sexual orientation, though (and I don't care).
If you plan on going, get there early, as it now crowds up more quickly than in past years, especially on weekends. I even found the weekday beach to seem busier than normal, but I suspect to some degree it's that we're packed closer together now.
One positive thing about a trip to Hanlan's is the fact that you can purchase your ferry tickets online now and avoid the painfully long line-ups.