Yes, basically. A major goal of opioid replacement therapy (ORT), whether via methadone or buprenorphine/suboxone/subutex, is to stabilize the patient by assuring a safe, uninterrupted supply of medication. In many cases, this allows the patient to avoid the nastier aspects of opioid addiction--overdose, acute withdrawals, illegal activities, etc.--while focusing on long-term recovery.
In practice, ORT won't leave the patient high. (If care isn't used in dosing, methadone will indeed get people high. Suboxone, though, is less prone to this.). The goal is to give the patient enough medication that his or her cravings aren't running the show, but not so much that he or she is nodding out.