If you drink long enough and hard enough, hangovers aren't a thing. It's not that hangovers go away, it's that they become a normal part of life and your body will eventually just tune it out.
At the end of my drinking career, I could black out multiple times a week and still be "normal" the next morning and didn't care or even notice if I was hungover or not.
For me, hangovers kinda morphed into something else entirely: dependency. That plays a huge part in muting anything that a normal person would feel, I am fairly sure.
But no, I don't drink anymore and haven't for a few years now. If I do ever drink again, hangovers absolutely won't be a thing because I'll likely be dead in a couple of days anyway.
I absolutely can't argue with what gives you worse hangovers. That's between you and your body.
Gatorade absolutely does have electrolytes: sodium and potassium. The problem is that alcohol depletes many more than just those. Pedialyte isn't much better with only the addition of chloride. If a person is a less than moderate drinker, water is likely just fine and any extra electrolytes would get pissed out anyway.