My own experience, since we're swapping anecdotes and beyond confirming that stuff exists, is that the people I've kept in touch with from that world aren't like that, whether they went to Peru once, or a dozen times, or never. They have reliably grown in ways they can't imagine themselves having done, without their work with the medicine. Since you can't A/B test someone's life, you can never say, but having seen however much of these people's lives, they all seem better off, in so many ways.
But selection bias is a thing, obviously. And dueling anecdata is interesting. Just probably not very useful.
EDIT: Phrasing
The 30+ crowd in Ayahuasca/Psychedelics have been some of the kindest, most giving people I have ever met in my life.
LSD on Empathy (Increasing altruism): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5813062/
LSD enhances emotional empathy: https://www.nature.com/articles/npp201682
Lifetime usage of psychedelics correlates to increase in nature relatedness: https://www.ncbi.nlm.nih.gov/pubmed/28631526
Anecdotally, 3 of my friends and myself (sample=4) all have self-reported significant improvements in empathy, as well as verified confirmation by our romantic partners. This has also led to objective changes such as volunteering, random acts of kindness, increased gratitude and altruism, and more.
There are also studies on terminally ill showing dramatic decreases in anxiety and depression: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5367557/
I don't know if you've ever suffered from either of these, but I can assure you, severely depressed or anxious people are not overly empathetic as they are ruminating and caught in their own minds more than being interested in others (overactive default mode network).
In short... there are numerous scientific studies confirming the benefits of these drugs. I fail to see any "overrated" potential after studying these molecules myself for years for experientially and academically.