Benediction, Hallowed Ground, Spirits Within, Circle of Scorn, Swiftcast etc. etc. It's prevalent throughout the game structure.

Turn on time stamps for your Battle Log.

It's more than annoying when the game blatantly ignores it's own rules; ie. taking damage time stamped in the log after Hallowed Ground's activation time stamp - time stamps make it horribly apparent there is a problem with the activation of a given effect that is certainly tied to animation.

Compensating and preparing is fine but instant abilities should be instant - or they need their descriptions modified to include a cast/delay time if there is an observable gap between using the ability and it's effect activating.