In the meantime, I got distracted by catching up with Ding!
Things I have learned about auto-follow:
Never follow a mage: Slow Fall from high places, Invisibility.
Never follow a priest: Levitation from high places.
Never follow a hunter: Misdirection.
Never follow a paladin: Divine Shield.
Never follow a shaman: Water Breathing.
Never follow a warlock: Unending Breath.
Never follow a druid: Cat Form/Prowl, Aquatic Form.
Never follow a rogue: Stealth, Vanish.
Never follow a night elf: Shadowmeld.