While I have found the majority of my interactions with Haskell (and ML family languages) deeply satisfying, I have never really used Lens in anger, having been

While I have found the majority of my interactions with Haskell (and ML family languages) deeply satisfying, I have never really used Lens in anger, having been put off each time I've tried to get into it. Although, I remain slightly simpathetic since - as you say - there is some theory underlying it all. I may be mistaken, but I think I have seen a handful of "Lens-lite" type libraries for use in production since it's such a large library, which seems.. uh.. suboptimal.