CNJ does fine with two attack skills (remember you can cross class Fire and Thunder from THM as well). Using Stone -> Stonera I can hit 1000-1400 with Stonera, Stoneskin and Protect keep you safe for the most part.

MP consumption is something you have to be more aware of now; what I tend to do is hit Blissful Mind at the start of a fight (before I buff), so that I know I have a decent MP pool ready when I need it (usually 500+MP at CNJ 50). Remember that Shroud of Saints regenerates MP as well. You don't have to AoE with Curaga (you can use Sacred Prism to AoE Cure/Cura). I don't miss the staff attacks at all because I never used them anyway. It's a shame we lost a lot of elements, but when you add Fire and Thunder from THM at least you're not too short.

Just remember that Fire always AoEs, as a friend found out to his cost last night, lol.

New CNJ concerned me but honestly it doesn't seem too bad. Just watch your MP, remember to use Cleric Stance if you get to nuke (and remember to remove it if you need to go back to support), hit Blissful Mind before any big fights, use Necrogenesis from THM as another method to heal (this is basically Bloodbath for mages). Probably an idea to take Second Wind as well so you don't have to rely on Cure/Cura all the time.