I think I might have gone to rehab if any of the rehabs that I thought looked good weren't exceedingly expensive. For example one in my area that looks decent is $30,000 for 40 days (I'm assuming that prices for rehab are ok to post, right?). No way in hell could I have afforded that. Then after being on methadone for so long, my primary problem was detoxing off of it, which I could find any detoxes equipped to help with, I called a bunch and all of them said all they would do was put you in a bed for a week while you were tapered off methadone or some said they could switch you to Suboxone and taper you off that. Not very helpful for me! Most rehabs around here (excluding the one I mentioned above which includes a 5 day detox) expect you to be completely detoxed before you can get in and are more for the helping you stay clean after detox part. I looked for unorthodox detoxes, one using ibogaine looked promising but again was very expensive ($10,000 for 10 days) and they said they were actually out of business because even at those rates they were not making enough money to survive, even as a non-profit. It was extremely difficult to find any options for getting off methadone. Methadone is believed by many to be a "treatment" for opioid addiction/dependence, and the most common ideas seems to be that either: A) you shouldn't try to get off methadone, you're supposed to stay on it for the rest of your life (common phrases being, "Addiction is a disease - if you were diabetic you wouldn't stop taking your insulin would you?" or, "Staying on methadone for the rest of your life is better than risking a relapse!"); B) methadone should be easy to taper off on your own at any time and any difficulty in doing so is solely psychological and undeserving of help; or C) you can always switch to Suboxone. I have huge problems with all of those ideas. I eventually ended up finding a good doctor who was willing and able to help me, but it was a huge ordeal with a lot of time wasted to get to that point. As for rehab back when I was using heroin and ended up going on methadone, the only option that was available to me and within my budget (zero dollars) at that time was a 5-7 day completely unmedicated detox with a long waiting list, followed by a rehab where all you really do is go to NA meetings every day. And it was very hard to even get any details about those options. Needless to say, I didn't like those options and ended up on methadone.
If I had had the opportunity to go to a GOOD detox and/or rehab things might have turned out differently.
EDIT: I really agree with neversickanymore that rehab isn't a cure and you still really need to be motivated and to do the work on your addiction, why you use in the first place etc. Most people I know who went to rehab solely because they were pressured into it (for example their parents made them go, or they had their kids taken away and going to rehab was a pre-requisite for getting them back) ended up relapsing soon after they got out. But I think (the right) rehab can be a very useful tool if you are ready to use it and you continue making changes after you get out. As for using it merely as a "holiday" from addiction, I'm not sure how I feel about that...