I've noticed th that players in both WvW and PvP Taking snipers cover, and trying to use it as a quick access to stealth, but get rofl stomped or don't get the most out of the time because they take too long to stand up.
If you take Snipers cover, and intend to use it this way. HOLD DOWN 5.
You will crouch down, and the moment Free Action becomes available, you will immediately get back up. This means it only gives you the half a second pause, instead of having the player spam 5 and fail to get up fast enough.