I, on the other hand, who used to live a couple of blocks from a McDonald's, never went in there. I've probably only eaten a meal at McDonald's once in my life. On the other hand, I have gone to Burger King several times for their fish sandwiches - maybe a dozen times in a decade.
As for their food being addictive, it's full of salty grease and sugar - they're not addictive in the sense that drugs can be, but people do get into a strong attraction for salty greasy food and sugar treats.
If I'm going to a fast food place, that'd be Subway - where one can do better at coming out of there having eaten something moderately healthy. That could be possible at Quinoz too, but I've only been there once.
And for great food that's fast, my favorite was a place with take-out sushi.