I've had two undeniably legitimate uses of Rescue this week: once in Bismarck Normal and once in LotA, all.on apparent newbies.
In Bismarck, there were at least four newbies to the trial, and four of them were the DPS players. I had to rescue a stray BLM onto Bismarck's back due to the player not realizing you need the Whaleback status to deal damage to Bismarck. They were probably about to go off on me til I explained it. There was also a misfortune-laced healer LB3 during it before a wipe (Bismarck destroyed the island) but once everyone knew what to do we made it through just fine.
In LotA, things were a little wacky in the three corridor boss arena. My alliance, C, had only 5 members before someone from the other alliances started the fight. One of the DRG in the party (the other was with another group) strated off the pad, leaving us with three on the pad. As soon as I noticed, I Rescued them back to the pad where they belonged. We did wipe, but to Ancient Flare and not corridor boss. Fun times all around.