AC Shadows is near perfect, but dang Eagle Vision is exhausting!

I really hope we get a single button Eagle Vision. Tagging enemies is nice, but can be tiring and can take a long time. I feel like Eagle vision should not be delegated to a tagging enemy. I like fast paced Visual feedback Ya know from the Brotherhood of Old. As of right now A single use of Eagle Vision is waiting 2-3 seconds to activate and then it fades with upgrades after a bit, Which is fine. But that activation time coupled with Tagging Enemies can take a long time. I am not some Master Assassin that can take a fort out without Eagle Vision leave that to LeoK and Jcers.