These days Chenkov is best replicated with some Tyranid and KDK formations that recycle dead units.
I find that strangely hilarious.
It's not as fun with bugs instead of conscripts because the bugs enjoy it
With conscripts you have the joy of the Commissar executing cowards, or deliberately destroying entire regiments just so you can bring in fresh regiments
Try doing it with Bloodletters, endless waves of daemon infantry pouring from the warp to hack and murder can be pretty amusing.
It's not nearly the same as hundreds of guardsmen holding the god damn line. One of the most satisfying feelings you can ever get is charging your conscripts through flamers, close combat specialists, barrages of explosives, minefields, dangerous terrain, devastating fire - and then your soldiers enter rapid fire range. "FIRST RANK" The general shouts. "FIRE" and buckets of dice roll onto the table. "SECOND RANK," even more buckets. "THIRD RANK" - hundreds and hundreds of shots rain down on the enemy; not all hit, but it is impossible to escape, at this concentration even flashlights become deathbeams. They keep shooting until their last bayonet is broken and their last shot is fired - until at last all men die standing.
AND THEN YOU SEND IN THE NEXT WAVE
FILL THE LAND WITH CONSCRIPTS
BLOCK THE ENEMY DOORS WITH CONSCRIPTS
SURROUND EVERYTHING WITH YOUR GLORIOUS 50 CONSCRIPT PER UNIT SQUADS
AND SEND IN THE NEXT WAVE
It just isn't as enjoyable otherwise. With Khornate demons, there is no gravity to their death. They are immortal intangible emotions, and they don't die too easy. Nidbugs are just bugs whose deaths are without consequence, and because their bugs do not feel fear and because the enemy is constrained by bullshit ammo rules they do not die as easy.
But with Chekhov spam you had humans - loads of them, who felt fear, could be pinned, broken, destroyed in a single charge or wiped out by artillery, could be forced into absolute panic if their commander was assassinated or killed charging a battle tank - and even when more conscripts arrived, it was always a dour fight for survival because the terrible thing was that the enemy would never run out of ammunition.
Ode to Chekhov, the mad space Stalin
*EDIT
Almost forgot about how you could also bring Al'rahem and infiltrate 50 conscripts to trap your enemy between conscripts and even more conscripts.
What's the meta like nowadays? I've not played 40k for a while but I'm helping some friends build a competitive list