Vessel Of Horrific Visions
Orgrimmar is widely considered to be the easier of the two cities for Horrific Visions, so if you're just getting started or you're still gearing up, this is a good week to get it done.
N'Zoth sure has done a number on Stormwind, hasn't he?
If you've felt frustrated at the pace of your Horrific Vision progress and want to be able to gather more Vessels and get your cloak upgraded faster, you'll probably like the hotfixes Blizzard has in store for you.
If you liked the Mage Tower in Legion, then World of Warcraft patch 8.3's Horrific Visions is content that is designed to appeal to you -- it's content you can do solo or in a small group (up to five players) and it's designed to start off with ramping difficulty that will eventually force you out until you get better at the encounters and better geared to resist the sanity draining mechanic of the Vision.