pawsplay
Hero
I'm going to have to quibble with you on this one. Given that Greyhawk was explored almost exclusively through modules and those modules were absolutely dripping in magic items, and very powerful magic items to boot, the idea that Greyhawk was somehow less wahoo than FR depended an awful lot on whether or not you actually played those modules.
Those adventures and opponents were exceptional. In Greyhawk, there was a town to go back to where the 6th level sheriff was not necessarily dripping with magic items and orcs were mostly worth fighting for coin and spare weapons. A world where a death knight had an 80% chance to be equipped with a magical sword. Certainly, Greyhawk could get a little wahoo, but on average, things tended to even out, and the wahoo generally did not extend to every corner of the gameworld.