I haven't found them to be very addictive either, physically at least. It depends on the dosage, and whether you actually take them as perscribed. I only take .5mg Xanax on most days of the week, but when I go without it, I don't experience any side-effects or withdrawl.I don't think you would even be perscribed a benzo at first. According to my tharpist they noramlly try SSRI's(anti depressents) first. You should talk to your therapist about your concern with benzos and that you would rather try something else. I don't think they are highly addicting either. They have a risk of addiction with chronic use but I don't think it's super high.
Even propranolol can cause dependence . If used daily, then heart rate increases upon discontinuation due to the rebound effect of the beta-adrenoreceptors no longer being blocked.I haven't seen any non-dependance forming drugs other than propanalol which isn't psychoactive anyway, unless people find cannabis to be effective for SA I don't think there are any. Even the ssri's cause withdrawls.