I've almost died twice but never had any kind of mystical experience, I just woke up in the hospital disoriented and blurry. But those experiences made me value life much more and I now see death as no big thing simply because I've already died twice essentially. Luckily I woke up both times but the feeling of it, of life just switching off, has left me stronger and way more grateful.
It's funny you say that, because it was the third one that things got all "woo woo" for me. My personal views on the whole "mystical experience" thing and spirituality is basically to accept that we are all one and part of something greater than this 3D existence. I think the harder we try to define what that is, we just basically complicate it unnecessarily. It is what it is. Interesting to hear you've also been to "the other side" though. :)