I DMed the original trilogy back in the '80s. I don't remember too terribly much about it, other than the fact that the players took an unexpectedly diplomatic route in the second module, which basically cut short the middle part of the trilogy, making me curse them endlessly for causing me to not get my five bucks worth out of the module! (By the way, the original trilogy is going for something crazy like $90 on ebay. I need to get mine listed! To buy more D&D stuff, of course!)
As for Greyhawk, I still have my map, which I had laminated. I don't know what collectors would say about that, but all I know is that it is still in pristine condition. Greyhawk was my nerd imagination fuel through high school and beyond, even long after I stopped playing D&D in '87 or '88. When we switched from D&D to AD&D and Greyhawk, I redid the origin of my first character. The magic-user Festusnima (a pseudonym to protect his true identity) was on the run from the mad king of the Great Kingdom, his relative. Festusnima's father had been the Marquis of the Bone March, until the hordes of humanoids overtook the country. Festusnima, then known as Bjoddar Thorstenson, barely escaped with his life, but not before discovering troops from the Great Kingdom roaming freely and unmolested by the invading humanoids. Also not before betraying hiding members of his family in order to facilitate his own escape. This had been his great secret and his great shame as he spent the next decade amassing power, a fortune, and a reputation as he set about to reclaim his heritage and exact his revenge on the Overking. With the help of adventurers he had met over the years (including Morphide, a fighter and escapee from the Bone March who knew Festusnima's secret, and Feelap Kiip, a thief from the Duchy of Tenh and best friend of Morphide--the two had a total Fafhrd/Gray Mouser vibe), he founded a fortress/city/trading post along the Wild Coast and set about conquering the Pomarj, intending to use its mineral resources to fund missions against the Overking and to, eventually, fund the army and alliances he would need to retake the Bone March and to use it as a staging ground against the Great Kingdom itself!
Whew! I don't think I've written anything about the synopsis of that story in over 30 years!
Funny thing (to me, anyway) is that I was always fascinated by the Valley of the Mage, but it wasn't until the last couple years when I was re-reading my Greyhawk books that I realized Festusnima would have been a distant cousin of the Mage.
So, yeah, experience with both Saltmarsh and Greyhawk (which I've argued in the GP Discord channel is a far superior gaming setting that the overly-populated, overly-detailed, overly-canonized Forgotten Realms).