LLMs help a lot in doing 'well defined' tasks, and things that you already know you want, and they just accelerate the development of it. You still have to re-write some of it, but they do the boring stuff fast.

They are not great if your tasks are not well defined. Sometimes, they suprise you with great solutions, sometimes they produce mess that just wastes your time and deviates from your mission.

To, me LLMs have been great accelerants when you know what you want, and can define it well. Otherwise, they can waste your time by creating a lot of code slop, that you will have to re-write anyways.

One huge positive sideffect, is that sometimes, when you create a component, (i.e. UI, feature, etc), often you need a setup to test, view controllers, data, which is very boring and annoying / time wasting to deal. LLM can do that for you within seconds (even creating mock data), and since this is mostly test code, it doesn't matter if the code quality is not great, it just matters to get something in the screen to test the real functionality. AI/LLMs have been a huge time savers for this part.