Oh absolutely, yes: Quite a few have become very good, and regularly correct me. This is how I learned, too. Just as a great programmer knows that the code isn't done when it works -- that's when you start -- writing doesn't end with the first draft.
Verbal advice is ephemeral. It's easy to not-notice something said in passing. And while there have been situations in which I learned at a master's feet in person -- particularly when he didn't realize he was teaching -- the grunt work of getting better at my job is a processing of making small improvements. So the opportunity to see, on the page, how someone changed the text, and why... that lets me compare before-and-after at my own pace, without anyone standing over me.
Needless to say I'm still close with those who mentored me and with those whom I've mentored. But "how to mentor" is, perhaps, a different discussion.