Yeah, if I count every professor I've interviewed with so far, that would be 14 interviews and I've never needed to produce my CV even though I always took it just in case. It's true, most people I've seen weren't carrying much of anything. But I really really relied on my little notebook to jot down answers to my questions; interview days are such whirlwinds, you think you'll remember everything they say but you won't. Or maybe that's just me--I'm an obsessive note-taker (I even took a note or two while talking to grad students at the dinner/social event... ).