As most have said, when I'm on the notFO side of the equation, I'm happy if S/D are kept up and Zallure is used (I don't have any characters awesome enough to regard Zallure as a "waste of time"). And if I'm on HUcaseal, naturally I enjoy being healed. Tech stun for Zu, lilies, etc. is good too.
I have gotten a nice bunch of weapons (hit Vivienne, Girasole, SoF, charge assault) over the course of the holiday event, and I do enjoy using them. But in a party with multiple very good damage dealers, I will rarely get the opportunity. Plus, I have to switch in several units (Smartlink, God/Arm, H/battle...I always have an H/power in to equip Parasol regardless) to make it worthwhile, so I usually try to plan ahead while still on the ship if I'm going to be doing that. Even then, I find myself using Grants more on the dodgy enemies, even with capped accuracy + Smartlink.