I've not played much WoW, was bored of it before even starting, but from my limited experience WoWs grinding is pretty easy compared to some other MMORPGs.
In Anarchy Online, for instance, people have been playing the same character for many hours each day, years in a row, and still don't have all their 'dream equipment'.
That's not even mentioning the grind to get to the highest levels( 200 normal levels, 20 shadowland levels, 30 AI levels), which is just insane. I'd guess going from AI level 29-30 alone probably took longer than 1-60 in WoW, although it's supposedly been changed with the latest expansion.
That's how these games should be though. This is what makes them last.