Feeling a bit ambivalent on this.
On one hand, non-griefing creepers removes some of the suspension when spotting one that's way too close to be comfortable. And they also harshly punish players that show even the slightest sign of recklessness, to hilarious effect.
But while playing online, creepers is your worst enemy. Server
side lag? You're dead!
Sudden latency spike because someone sharing your internet connection decided to stream video in 4k, when their monitor only supports full-hd? Your sweet new redstone contraption is a thing of the past, AND you're getting the electric chair.
Creepers while playing online feels way too unreliable, and to be perfectly honest, it's probably for the better that mobgriefing is turned off.
Regarding endermen, I don't have any strong feelings one way or the other.