Exactly. 

Googled the definition of "pagan": "a person holding religious beliefs other than those of the main world religions."

Seems pretty vague and non-descriptive.  Since hundreds of different religions get classified as pagan, calling yourself pagan doesnt really identify you very well.  Many of the "pagan" religions are so different from each other that is seems overly simplistic to classify them together and I think kinda degrades the religions classified that way.

Personally, psychedelics led me to a similar view as pantheists.  I think this is more accurate to describe myself as then pagan, partly because pagan is too vague, and partly because I do not believe in any traditional pagan Gods or holidays or religions ect....