Yup, quite a bit. I have a writer friend who acts as a sounding board for anything I'm stuck on. She reads the story as a regular follower and reacts very strongly to it, but also digs the background info I give her and the previews she gets to see when I'm having trouble.
I think the key to not spoiling anything is to go into those discussions knowing what you need.
I often ask things like
'What impression does x give you?'
or
'Look at this panel. What is happening here?'
or
'Does x character strike you as y?'
The answers to these questions are simple. I'm not asking my friend how they would do things or even if they like it, just touching base with them to make sure I'm on track. I can also trust her to be honest with me and give advice objectively without being overly harsh or critical. She's my friend, not my teacher, and we see it as more of a collaboration than a lesson.
I don't receive unsolicited advice, thank god.