I'm here because and while it's enjoyable - LW is marked as part of the Internet-as-TV time budget. That said, I feel more rational, I think because I'm paying attention to my thoughts. But e.g. I'm not actually richer and don't have a string of interesting new achievements under my belt. The outside view shows nothing.
If your answer is "it would look like the world is now" - then what would the world look like if it was effective and did work, for whatever value of "work"? (I'm thinking a value something like "what one would expect trying a new thing like this and wanting to get tangible self-improvement value out of it", though I'm open to other possible values I haven't thought of.)
LW doesn't seem to have a discussion of the article Epiphany Addiction, by Chris at succeedsocially. First paragraph:
I like that article because it describes a dangerous failure mode of smart people. One example was the self-help blog of Phillip Eby (pjeby), where each new post seemed to bring new amazing insights, and after a while you became jaded. An even better, though controversial, example could be Eliezer's Sequences, if you view them as a series of epiphanies about AI research that didn't lead to much tangible progress. (Please don't make that statement the sole focus of discussion!)
The underlying problem seems to be that people get a rush of power from neat-sounding realizations, and mistake that feeling for actual power. I don't know any good remedy for that, but being aware of the problem could help.