Can confirm. The Fallout 4 CS is very different from the 3/NV GECK. I wanted to change a few creatures to be more to my liking, maybe make a few custom ones, and... yeah, I couldn't even figure out how to add or take off the little parts that make them up, which in the GECK was as simple as clicking a little tab.
I think how different it tends to be from Bethesda's older creation kit layout that was used to make every game from Morrowind to Skyrim kinda pushed a lot of modders away. I haven't made one personal mod for Fallout 4, even though I've made personal mods for Morrowind, Oblivion, Skyrim, Fallout 3, and New Vegas. The creation kit is just too much of a pain in the fucking ass to learn, whereas the last iterations were actually really intuitive and easy to learn.