Some trance, of course, is trancey, but a lot just isn't. The music from when the name 'trance' was first given was trancey, that early, classic stuff. In my opinion, the more complicated the melodies and everything get, the less hypnotic it is. But that's OK.
As far as goa/psy goes, I'd say the most "trancey" I've heard is Blue Planet Corporation, especially the stuff on Blueprint For Survival, because it's so much more like classic trance than goa.
Now, I think music can be 'psychedelic' without being 'trancey'. A lot of goa/psy is psychedelic to me without being trancey.