Zilean revives after death, he doesn't kill something in death.
It takes forever to revive and more than enough time to run, and if you can spare the time you can just wait for the ult buff to ware off, now he's wasted it and he doesn't revive.
Yorick I will admit is a bit annoying, but again, he's underpowered and trades that for some of his normal strength.
Tryndamere never dies, so it can't really be considered after-death.
Aatrox is extremely underpowered and his ultimate is worse than GA, its basically just there to distract the enemy team into huddling around him when they take him down.
All of those were revival mechanics, not after-death mechanics and they are extremely different and everyone with them is more balanced than a lot of champions without, with the exception of Aatrox because lifesteal is hard to balance and it isn't his revival passive, and Yorick because well... seems like Riot has just left him in the dust and forgotten about him, really.