Not everyone feels the "presence" you're talking about while smoking Salvia. Something like that is more prevalent with the use of a tryptamine like DMT.

Nevertheless, Salvia is an utterly intense and unforgettable experience. My first few times I got the major pins and needles, like you're talking about, and I felt like I was a part of and SAW the inside of this huge, metallic, gnashing alien machine.

Anyway........discussion of psychoactives other than weed is prohibited here, so *shrug*