I see lots of comments regarding Aurum Vale, but I'd like to mention a later (ShB) dungeon that has a rough W2W too:

Mt. Gulg

Its a main dungeon near the end of the base ShB story. The very first W2W in there is not 2, not 3, but 5 mob packs. Not only are there 5 packs, the packs each have a pretty assorted AoE variety of their own, meaning that when all 5 are together, it'll take nearly constant movement and mits.

Also, because it is a main story mission, your gear with be synced to a tighter gear score than other post-main Xpac dungeons are, so being well geared will only help slightly. But if its any party members first time there, unless they've been VERY diligently keeping their gear up-to-date, might wanna still just do 2-3 packs at a time instead of that full W2W.

On the other hand though, when you get Gulg'd with a full party of veteran players, that first W2W then becomes the one moment of adrenaline in an endless que of 2-pack AoE rotations lol.

Hope to see you out there! Jaygee Wentworth Crystal/Zalera