my family did a somewhat intervention for me and yes, i feel like it helped me but i really wanted what was being offered. in my opinion, interventions only work if the addict wants to work a program. like the others said, the loved ones get to state their boundaries and how they feel and in that emotional moment, the addict may very well agree to rehab but that is only the beginning of recovery. the real work for the addict begins after rehab and there is nothing more the family can do to make the addict work their program or prevent them from relapsing.
i feel that if an intervention is to help you feel better, then go for it. keep in mind, the results may or may not be what you expected. you and your family are in my prayers.