Who uses [the Guiraud recitatives] now?
The Met does, in its last two productions. The two before that started out using dialogues, but eventually switched over to Guiraud. Some of the regional companies I usually attend do, sometimes. I can't believe those are the only ones. I imagine most companies that do use them don't even mention Guiraud, so it's difficult to research. I did find that last summer's Chorégies d’Orange production, with Kaufmann and Aldrich, used the recitatives.
I'm not defending the MODO, production and agree that the changes are quite different from Guiraud's, but I still think the Guiraud version really isn't Bizet's Carmen. Closer than MODO, certainly.