OP IS Zen, a Godsend, a bit of serendipity - however you'd describe it. I'd have to say I've stuck with it as much for the mental aspects as the health.
Just the physical act of swishing gives you a wonderful mental respite for about 2o minutes. I can't dwell, fume, ruminate, worry etc when I'm swishing. I don't know why not, I just can't (even though I can easily spend much of the rest of my day doing just that). So a nice little 20 minute vacation - or a bit of Za-Zen to start your day as Molly might put it.
Then there's the fantastic feeling of both physical and mental lightness immediately after the pull. People here say that has to do with the mini Liver Flush effect - and given the sensation, it seems plausible to me.
Thirdly there's the feeling you get looking in the mirror at your youthful skin and hair. None of this is earth shattering, but it IS Zen, and a wonderful routine that can get you back to center when everything else seems to be upside down in your life. Unfotunately, I can relate perfectly these days.