You’ve got it backwards. Or at least part of it.
A SSM ban is like the state allowing you to buy a car, but not allowing you to get a license, plates, insurance, or any of the other things that make driving safer and legal. Everybody else gets a license, but you don’t. Why not? Oh, some arbitrary reason. Let’s say it’s because you’ve got green eyes.
All of the non-green-eyed people are free to enjoy the benefits of automobile ownership - driving to the store, taking a road trip, or driving to a doctor’s appointment. But if you choose to actually drive the car you bought, you’re always running the risk of getting in to serious trouble.
If you get pulled over for a minor infraction - a broken tail light, speeding slightly, or whatever - you’re busted for driving without a license/insurance/registration, and you go to jail. If you hit somebody, and, god forbid, injure them, then you’re completely fucked - remember, you can’t get insurance. Not only do you go to jail, but you lose that car along with everything else you own.
That, beyond all the mushy lovey dovey stuff, is what life is like for committed gay couples. I know two guys, let’s call 'em Adam and Steve. They own a rather nice townhouse. Steve’s parents don’t approve of his homosexuality. If Steve gets hit by a bus, Adam is up shit creek. It’s entirely possible that he could lose their house. Yeah, they’ve got a will, but there’s a very good chance that the parents could have that broken in probate court. After all, Adam and Steve’s relationship has no legal standing - as far as the State’s concerned, they’re roomates, not a family, and all of Steve’s property should go to his closest kin: his parents.
If I get hit by a bus, all of my property goes to my wife. I don’t even need a will - the State assumes that since we’re legally, officially married, she is my closest family.
That fundamental unfairness is nothing like a smoking ban at all. It’s far, far worse.
The net effect of this smoking ban is that I have to walk a couple of extra hundred feet a week. The net effect of the SSM ban is that loving couples can have their lives completely torn apart.
Big difference, but not like you think.