I certainly overdid meditation, doing it twice a day for 10 years, and also, while it was still Rawat's commandment until he quietly dropped it, I tried to do it all my waking hours.  But I can't say I was ever addicted to it, because it mostly just became drudgery, or an excuse to sleep.

I do think I used meditation to repress doubts, though.  When there was "room for doubt in my mind" and I actually had them, I got  very uncomfortable and I used "holy name" (aka, "technique number 3, following your breath), to try to stop thinking the doubts.

That was particularly damaging IMO, but I wouldn't call it addiction, because I got nothing out of it except the recognition that I was trying to do what I was commanded to do by my Master, Prem Rawat.

I cannot relate, though, to meditation ever becoming a physical addiction, not that it isn't for some people.