Is there a macro/add-on/anything that would be able to show cast bars for all active mobs in a raid? For example in Horridon I could be DPSing one mod and notice a different Venom Priest was casting Venom, quickly focus and interrupt..
I currently have DBM & quartz, but can't figure out if quartz has this addition.
It isn't possible to get casting information on mobs that you do not have set as your target, focus, or mouseover. Tidy Plates has an option to display casting bars on non-targeted units, but it requires you to mouseover units to refresh their casting status.
It looks like Blizzard is actually fixing this problem in patch 5.3 based on the PTR notes on the front page.