While I'm by all means an avid pony fan who will aways hold the series with high regard, I can't say that I ever truly devoted a sufficient amount time to MLP; at least not to the point where my thoughts were dominated by aspects of the show. Back when I first stumbled upon the series, my mind would routinely wander off to thoughts of the latest episode, or a particular character that I'd like to draw up, though this absentmindedness never progressed into something resembling an absolute absorption of sorts, likely because life commitments kept me occupied to the point where I wasn't able to engross myself within the Brony community. By the time I did engage more directly with the fandom (namely these forums), all the unconventional qualities which initially sparked my interest in the series had subsided to the point where the show no longer had a tendency preoccupy my thoughts on a regular basis.
While I'm likely the anomaly, MLP will likely always be a relatively laid-back hobby of mine, as opposed to something resembling an idée fixe.