Yes, GPT4 is very noticeably smarter than GPT 3.5 or any of the competitors like LLAMA 2. I rank almost all LLMs at the same level as a high school student, and GPT4 at the level of a graduate student just starting out as a junior employee.
However, I don't need a "junior" assistant, I need more of "me", which GPT4 can't currently emulate.
If I were to hire a flesh & blood human junior tech, that would be with the expectation that the junior would learn with time and pick up the specific techniques and approaches I prefer to use. Currently, GPT models cost an absurd amount of time, effort, and money to customise, and there's little chance that this would result in the equivalent of a trained employee.
These days I don't write much code, and the code that I write I can bang out faster than I can explain what I want to ChatGPT.
I've also found that the act of coding is a part of the learning process. I can't really understand something until I've taken it apart myself and put it back together again.
I keep telling my customers: I can teach it to you, but if I learn it on your behalf, you'll end up knowing nothing yourself.