Thanks for taking the time to explain, but if I understand correctly in the instances you relate, you were taking mushrooms specifically in order to get high, correct?
Whereas the OP (root of the thread) is talking about microdosing, which is, if I understand it correctly, taking drugs in an attempt to not get high, but get other benefits?
As to the "powerful feeling of connectedness with the universe", well, I've been drunk and I found that I loved everybody around me and I felt a strong emotional connection with total strangers. But, I was drunk. It's relaxing, it's disinhibiting, it's fun, it's making yourself deliberately and temporarily mentally impaired, why not? But there's nothing more to it.
In fact, I'd go as far as to say that the defining characteristic of intoxication, in my experience, is of being dumber than usual, which can be suprisingly enjoyable. Certainly not something to be desired as a constant state, though.