As a kid, whenever I saw Grant/Breyfogle/Mitchell on the cover I knew I was in for a treat.
And I know its a little thing, but there's a moment, I think in the Obeah Man arc, where a flower or something comes up as a clue. Bruce isn't familiar with it, so he heads to the Batcave's library to do some research. I just loved how he didn't immediately know exactly what it was and actually cracked open a book to find out