Leashing your child at Disney World

I was in the World a few weeks ago and one of the surprises was how many guests were leashing their children. Now I am not talking the special needs harnesses for children with special needs, I understand and comprehend the need and circumstances.
I saw parents that tethered their children together like the chain gang, which made it difficult to bypass the family. Parents whipping their kids around that were in generic harness, yanking and flipping them around. There were so many different versions of taking your child for a walk in the parks I was dumbfounded.
And then, the on and off the attractions while tethered. I was actually surprised Disney allowed this. A parent pulling their child off the boat by a leash like she was fishing and the kid flopping on deck like a fish being reeled in.
My children are young adults and admittedly I am out of touch with the new child raising techniques. When my kids were young and when I needed to keep them close, my DH and I were old fashioned, we held their little hands. When did this become obsolete?
Some people are like Slinkies.
They aren't really good for anything,
but they still bring a smile to my face when I push them down a flight of stairs.
Friends are Gods way of apologizing to us for our families.