I didn't play FO3 when it came out in 2008, so don't know how long it took before the GECK followed, but did see the Creation Kit come out long after Skyrim. I'm a bit spoiled when it comes to quality-of-life mods and don't know if I can get through the FO4 vanilla. I'll jump in and do a few hours of play for a general review, but I see myself turning the game off until the GECK drops.
I need darker nights that require light sources, backpacks, and multiple companions, at least 2-3. I know you, Bethesda. I know you! You won't give us these things, because you're like the parent who doesn't want the kid to have TOO MUCH fun or our brains will explode. Besides, I want to get started on a major mod project. It's about time someone drop the bomb on my hometown: Fallout Music City. (You's all gonna die fools!) So I'm eager for the GECK to drop ASAP!