I did a small experiment, composed the same cgi composition in AE and Nuke. I didn't see any big speed difference. Everyone is now horny on node based editors, the 3d aplications have now node based material editors everything is now node based. Its sooo cool, its soo faancy, so great.....I hate it.
with A over B thats true. but by the time you need to do one precomp in after effects to get something to work you loose a generation of quality and speed.