Kiting works in dungeons, but you'd ideally run in a circle so the DPS don't have to move much, and so their AoE reaches the enemies. This is mainly necessary if the mitigation/heals aren't enough, which is rare but is particularly the case in older dungeons, especially leveling dungeons. It can give novice healers time to cast a heal spell at levels where tanks lack a lot of heals of their own.

I agree that in the open world, kiting isn't really a thing because the enemies do not have much HP. The most challenging enemies are typically the ones in Heavensward areas, but they never scale enemies that way in any other expansion. If you kite FATEs, you will often run out of the FATE area, and this is common due to enemies spawning at the border (a baffling decision on the developers' part).

Usually if a regular enemy needs kiting, it's either intended for a party or it's a quest enemy that is meant for you to use a special item on to reduce its HP.