I recognise this from doing shamanic practices, like soul flight / drum journey (a kind of guided meditation), and various shamanic plant ceremonies. There is this distinct feeling here of going into the unknown, exploring new aspects of life. The plants are powerful and amplifies the experience and also open up new realms, but I often find the meditations just as powerful and enlightening. I find it good to do both. Thanks for an insightful post and the Kabat-Zinn quote :)