I should probably add that Shock Squall is also useful. I also concur that the post 75 wards generally have uses that aren't super niche, even if it is often not MP efficient and creates too much lag time time when dealing with a single mob. Delves and the longer kill cycle makes these somewhat more useful again.

Duration however is a problem, especially with Geo auras now being able to apply debuffs and Geos aren't time limited to 45 sec BP timers so they can potentially be doing a lot more in between.