CGI is definitely not quicker, it take months and months and months of processing.
Go-motion = stick a maquette in front of a blue screen, puppeteer it in real time, then composite it. Fairly straightforward.
It's just that the effects industry, producers -- and of course audiences -- are so lazy and accustomed to the same kind of ugly, instantly dated, grotesquely expensive CGI crap time and time again that that's all anyone thinks to use anymore.