If you're ghosting, you shouldn't even be attacking anyone. Ghosting means sneaking your way through a level and leaving no trace behind. Bodies, living or not, are traces.
There are many ways to sneak through the game without resorting to violence. 1) Blink past guards or find alternate entry points. 2) Bend Time to sneak past guards or pickpocket their keys to gain access to locked areas. 3) Possess guards to move through the environment unhindered. 4) Summon rats and then possess one to sneak past guards. 5) Hit a wall with your sword to make a noise and distract guards. 6) Shoot a wall with your crossbow to make a noise and distract guards. 7) Fire your pistol to make a noise and distract guards. 8) Blow up your grenade to make a noise and distract guards. 9) Possess various animals to sneak past guards and/or gain access to alternate entry points. 10) Bend time to allow you to make noise (like shattering a glass case containing loot) without alerting guards. 11) Pick up and throw random objects to distract guards. 12) Hide in shadows to make yourself harder to detect at a distance. 13) Use Dark Vision to track guard movements and vision cones so you can avoid them. 14) Look through keyholes so you can scout rooms before entering. 15) Close doors to obscure NPC vision and reduce the range of sound coming from inside the room. 16) Blow out candles to darken the area and make yourself harder to see at a distance. 17) Lean around corners to observe guards without exposing yourself.
Stealth has always been a minimalist endeavor dictated by restraint. If you wanted to, you could go through Thief headshotting guards with your bow. You could go through Splinter Cell headshotting guards with your guns. You could go through Hitman mowing down guards with assault rifles. Neutralizing guards has always been a simple matter. Ghosting is not. Dishonored offers more ways to be sneaky than any other stealth game.
You took the path of least resistance and just knocked out every guard you encountered. That's probably why you never felt the need to fully explore the game's mechanics and how they can be used for stealth. It's like playing a game on Easy and then complaining that it was too easy.