A few I thought I needed for my specific work a year ago. I decided to learn Maya instead:
I needed this for broken FBX import/export
https://blendermarket.com/products/better-fbx-importer--exporter
For Rigging to emulate C4D comparable features:
https://www.blendermarket.com/products/voxel-heat-diffuse-skinning
https://www.blendermarket.com/products/blender-retargeting-tools-1
https://www.blendermarket.com/products/auto-rig-pro
https://www.blendermarket.com/products/vehicles-rig-factory
RTX/GPU Rendering
https://ecycles.gumroad.com/l/E-Cycles
Modeling (just for the awesomeness):
https://www.blendermarket.com/products/hard-ops--boxcutter-ultimate-bundle
https://blendermarket.com/products/decalmachine
Multiple UV tools, because I found uvs in Blender really lacking:
https://www.blendermarket.com/products/hard-ops--boxcutter-ultimate-bundle
That is my personal stuff of course I collected a year ago. After that I didn't really follow Blender anymore.
Some of these make Blender superior to C4D (especially the modeling and rendering) others are there to simply catch up with C4D (Rigging, UVs, Scene Management etc). Overall I found a lot missing in Blender and in general put the fanboy talk into perspective. But the fact that there is such a well developing plugin market is simply awesome.