Imps' fireballs are harder to consistently catch and throw back though due to the timing and trajectory of their projectile. The xenomorph like Vulgar on the other hand, you'll succeed with them pretty much every time. Smaller enemies like Cherubs you can instantly kill with the Grabber too! Background objects like random boxes or tools you can grab and throw at enemies as a quick defense mechanism as well.
Probably the funnest challenge is catching a Revenant's rocket with the Grabber, though more often than not you'll merely deflect it than send it back at them. Throwing Hell Knight's fireballs back at them is probably the most satisfying in the sense of how much ammo it saves you, though it takes a few of their projectiles to put them down, and so can get kinda redundant.
Posting this for posterity I guess since I came across it.
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I know there's actual Japanese Doom fans and such, but seeing it from the normie/casuals' perspective is still funny. "Green Samus" is not at all dissimilar to the nicknames that Western Smash fans come up with for the anime swordsmen and such.