I had not realized that she was the first woman to win a Hugo Award and the first to win a Nebula Award. I'm with perldiver: The world was more interesting for her presence.
Years ago, I was in the Fort Weyr fan club, where I learned to write stories that I think were at least decent. This... makes me an author influenced by Anne McCaffrey. I eventually moved into running RPGs and writing reviews and papers on topics both academic and fannish, but I can trace the path back to Fort Weyr, and to a growing confidence that I could turn out a decent story that fit solidly in someone else's sandbox.
Correction via womzilla: Important niggle: she wasn't the first woman to win a Hugo Award. Cele Goldsmith was awarded a special Hugo in 1962 for her editorial work on Fantastic Magazine. McCaffrey was, however, the first woman to win a Hugo Award for a work of fiction.