Sriram,
1. Certain experiences such as spiritual experiences, depend on brain wiring. If the wiring is not right, the person will not be able to experience such matters. This is fact as per the article above.
Actually the article suggests that anyone's brain wiring might be changed "if you contemplate God long enough". Why should this be so surprising? The brains of people who have had strokes can change to allow some functionality to be regained by alterations in neurological pathways. There is some evidence that London cab drivers who have the 'knowledge' show brain changes in the hippocampus. The brain is a malleable entity which is capable of development in all sorts of areas given the correct inputs.
2. Since it depends on brain wiring, the experiences need not be purely imaginary or wishful thinking. It could be our connection to a reality that some people are unable to experience. Just as brain wiring enables eyesight, hearing etc. these internal wiring could connect us to a reality that is not otherwise obvious. Since most spiritual people agree on the many beneficial effects of the experiences, they can be taken as real.
There is no reason not to think that such experiences are intense personal experiences and they are very much distinct from eyesight or hearing. With eyesight, for instance, we can ascertain whether we are seeing something objectively real by using other senses for verification. E'g. If we see a brick wall, we could try walking through it to see if it was real. other people would also see it. On the other hand, if it was an hallucination, there would be nothing to stop us walking through it. Spiritual experiences are of a different class altogether. There is not the slightest evidence that they are connecting us to a different reality. We only have the assertion of someone who may be interpreting their own subjective experience in that way, be it as their particular god, or some sort of universal consciousness or whatever.
I have no problem with the idea of the benficial effects of such experiences because it seems they release opioid peptides and dopamine, which gives a sensation of satisfaction and supression of pain.
3. Evidence in objective terms cannot be provided. Only anecdotal accounts can be provided. So, stop asking for 'evidence...evidence'. If you can't see it...you just can't.
Unfortunately the suggestion that we stop looking for evidence is a no no, because the only other alternative is to accept anecdotal accounts without due examination.
Perhaps, because you are asking us to suspend our disbelief, it just might be that your brain is wired in such a way that you give such little importance to evidence.
As you say, 'If you can't see it...you just can't.' However I live in hope that one day your brain may develop such important critical faculties.