In the end, I was able to rescue the code part, rebuilding a 3 month long 10 person project in 2 weeks, with another 2 weeks to implement a follow-up series of requirements. The sheer amount of discussion and code creation would have been impossible without AI, and I used the full limits I was afforded.
So to answer your question, I got my money's worth in that specific use case. That said, the previous failing effort also unearthed a ton of unspoken assumptions that I was able to leverage. Without providing those assumptions to the AI, I couldn't have produced the app they wanted. Extracting that information was like extracting teeth so I'm not sure if we would have really had a better situation if we started off with everyone having an OpenAPI Pro account.
* Those who work in enterprise know intuitively what happened next.