Pretty much all of the "standard" stuff is really easy and fast to make with a proper editor. Like this is the GUI editor which is much faster to use (and someone who doesn't want to touch any code could edit the main menu) than editing like 3 separate files:
And the material editor is an absolute pleasure to work with and reduces weird issues with textures so much:
But then things that are uncommon are very difficult to find out. Like using dynamic meshes as a moving character took me an entire day and reading through tons of slightly related threads.
Also I don't think I've benefited that much from the earlier code as I haven't done these things before, but I did almost completely reuse the membrane generation. I think the quick progress says quite a lot about how easy it is to use an engine that has so much documentation and large premade functions.