I've seen Myskina and Kuznetsova play qualies at the US Open before.
I know Kournikova (former top 10er) came through US Open qualifying in 1996.
Justine Henin-Hardenne has played Grand slam qualies as well. Same with Molik, Mauresmo, Zvonereva, Petrova, Schnyder, Dementieva, etc.
Pretty much every top 10 player goes through Grand slam qualies at some stage. People like Venus and Serena and Capriati and Seles who are handed practically unlimited wild cards from the time they are 14 is an extreme rarity.