True enough, but I think that a lot of "actually programming the thing" turned out to be "figuring out what exactly needs to be programmed". Afterwards, people did not want to admit that this was the case, perhaps even to themselves, because it seemed like a failure to plan. However, in most (nearly all?) cases, spending more time prior to programming would not have resulted in a better result. Usually, the best way to figure out what needs to be programmed, is to start doing it, and occasionally take a step back to evaluate what you've learned about the problem space and how that changes what you want to actually program.

In other words "figuring out what needs to be programmed" and "actually programming the thing" look the same while they're happening. Afterwards, one could say that the first 90% was figuring out, and only the last 10% was actually doing it. The reason the distinction matters, is that if you do something that makes programming happen faster, but figuring out happen slower, then it can have the surprising affect of making it take longer to get the whole thing done.