It is not true that you need annual vaccinations for chickenpox "each and every year." It is true that over the age of 12, that you do need two doses of vaccine to develop adequate protection, but at this point there are no specific recommendations for further vaccine boosters. Other vaccines have initially been recommended as single injections, but over time and with ongoing surveillance, boosters have been recommended.
There is a controversy on whether to immunize everyone or would it be better to get the disease naturally and be immune for life. In newborn infants, adults, pregnant women, and immunocompromised patients, chickenpox does pose special risks. So the theoretical risk that over time adults will not have adequate protection from being immunized in childhood raises the concern of more cases of chickenpox in adulthood.
Vaccines have been very effective and have contributed to a significant decline of many infectious diseases of childhood. Whether this will happen with the administration of varicella vaccine is to be determined with the current long-term studies being conducted in children and adults.