I have been a daydreamer all of my life, too. I don't know whether it's completely maladaptive or not, however. I'm usually able to turn it off at will. I realized it was getting the better of me at a fairly young age, and trained myself in my teens to focus my attention to tasks at hand more mindfully.

I do still fall into it when the stress becomes too much.

I do know I have it because I'm a creative type; and it has helped me in the past to unlock new ways of looking at things. And real life (let's be honest!) can be exceedingly tedious and boring. But I also know that I developed it as a coping mechanism, because there was so much childhood emotional neglect in our home. Daydreaming was an escape from all of the confusion and stress and sorrow.

It's about finding that balance between the blessing and the curse aspect of it. Not allowing any ONE THING, one habit, to have complete control over me has always been my conclusion, as that would be maladaptive, for sure.