A question, of course, it what happens to the first person that's hooked up to one from birth, as an experiment.
... and yeah, I'd probably end up addicted to a sufficiently immersive "full dive" type thing. If I could dream for literally days straight, I would, without hesitation, staying in the waking world strictly insomuch as necessary to spend time in the dreaming one.
It's almost at odds with my fairly vehement hatred of psychoactives and hallucinogens, but, well. Spending all or most my time indulging in a structured fantasy world (or my normal dreamscapes, which frankly tend toward just that) actually sounds fun and enjoyable, as opposed to anything I've heard described as a drug-induced experience. Addiction would come because actual reality is frankly kinda' bloody boring,* on a comparative level. Science is awesome and all, but those of us not terribly geared for the work of it don't really get to interact with it much, and a simulated magic system would probably be a lot more... visceral. World of difference between a flamethrower and burning things to ashes with strictly the power of your mind (as interpreted by a hyperadvanced program, but whatev').
*And anyway, by that point we'd likely be able to manage assistant AI-type stuff anyway, so there'd be no real need to come out. Let the bots or digital mind-clones do the work necessary in reality. I'll stay where it's actually interesting.