Just to offer another perspective, I work for a small consultancy and routinely do our "exec" interview. This is a free-form interview with a member of our leadership team as a final check on the candidate.

I ask candidates some questions about their work history, interesting projects, and follow up on other interview sessions. I always offer them time to ask me questions, and those questions most often make the difference between my recommending them for hire and not. I see those questions as a window into what the candidate values most and find them to be very insightful.