Game 5 of H2K vs Fnatic is proof that death timers are out of hand
Fnatic won a single team fight 30 minutes in and was able to push from mid lane outer all the way to the nexus and win before H2K respawned. If that isn't evidence that death timers right now are way too long, then I don't know what is. That's absolutely ridiculous that one fight in the whole game can completely cost you, even if you have all your turrets in a lane up.