I either don't know or don't understand the question. Or maybe both. As far as I know, when I'm in a positive state of mind, I don't feel connected in any different kind of way, I just feel positive. I do withdraw into myself when I'm in a negative state of mind, though, so maybe it's just myself.
I have felt the "connected to everything" description before, but that's very rare, and only when I feel happy and at ease.