Can’t speak for the OP, but I think I understand the appeal. After trailering boats and fighting the good fight with saltwater since age 16, I finally conceded defeat about 3 years ago, began sling launching and have never looked back.
I rinsed with freshwater religiously and thoroughly, both after launching and retrieving. Refused to launch anywhere that didn’t have a wash-down. Unplugged lights before dunking in water. Minimized how far the trailer is backed into the water (roller trailers are great!). Trailered almost exclusively with galvanized (not painted) trailers… Still, it seemed like every trip involved some fix that was corrosion related, usually lights, sometimes more.
Now, my preferred method of launching is via a phone call to the covered/heated drystack marina while driving there in my car at 30 mpg (hands-free speaker phone, of course!). These days, the only trips to the launch ramp are on the busy holiday weekends to enjoy the show. (BTW, 13-lane Everett ramp is fantastic entertainment, especially on minus tides!)
But for the 2 years prior to drystack, I was using public sling launches almost exclusively (Edmonds and Anacortes), and discovered many perks that were not expected. Never did I encounter a crowd or long wait like you sometimes get at ramps. When single handing, as soon as they lift your boat off the trailer, you go park the trailer…by the time you are back, your boat is in the water and ready to go! It's the reverse coming back in - you always have a dock hand or two to help, while you go get the truck. There are certainly more launch points with ramps, can’t argue with that. As to the possibility of a dropped boat, yes that is a risk. But so is an auto accident or trailer failure (as some C-Brats can attest to!).
So yeah, for the past 3 years I’ve not launched a trailer into salt, and the last 1+ year I’ve not even trailered. Life has been so much happier without! Anyone want to buy a 2016 tandem axle galvanized roller trailer set up for a 22? It has literally never been in salt water! (Fits a 23 Venture just fine too!).
Like most things in life there are pros and cons to both. Now the real question worth debating is, Single or Twins?
-Mike