First off, this isn't a valid comparison, because it's far easier to explain a story than it is to explain an RPG setting,
I mean, as someone who knows what Swords and Sorcery is, I'm gonna counter argument this pretty hard by providing elevator pitches for more 2E stuff
Forgotten Realms: Kitchen-sink where most of the D&D video games take place, full of famous characters like Dritz and all that
Birthright: Kingdom building, the setting.
Ravenloft: Gothic horror, but D&D
Birthright: You wanna do kingdom building? Welcome to kingdom building land
Mystera: The other kitchen sink setting, except its gone full on pulp, has developed along with D&D and has some oddities (Flying gnomish skycity) and has a hollow world inside it.
Eberron: Fantasy post WW1. Industrialised magic in a shades of grey world where the scars of the last war are keenly felt and its possible another war may be on its way
Dark Sun: The world is dying, ruled over by tyrant kings wielding the magic that drains the world of its life. The best weapon you can find is your former party member's femur after some horrible monster tore him apart
Spelljammer: Fly boats through space, hire hippo mercenaries who love gunpowder and explosions, and fight against evil space elves who've bio-engineered Guyvers for themselves
Planescape: Travel the planes, barge into the god's houses, and behold the city at the center of everything. The setting for the best D&D video game, Planescape: Torment.
Council of Wyrms: You wanna play as a dragon? Here you go (also I guess it has alternate rules for other stuff but, you came here for the dragon)
What is Greyhawk's elevator pitch? What's just, a quick one or two sentence 'This is why you should play this setting' thing to come up with?