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People routinely get boosters for illnesses such as chickenpox, tetanus, diphtheria, mumps, measles, and rubella—to name a few.

Nonsense. People are not "routinely getting boosters" for these illnesses.

Chickenpox - No CDC documents contain the word "booster." From WebMD:

Who Should Get Vaccinated With the Chickenpox Vaccine?
The chickenpox vaccine is recommended for all children under age 13 who have not had chickenpox. It is also recommended for all adolescents and adults who have not been vaccinated and have not had chickenpox.
If you have had chickenpox, there is no need for you to get the vaccine.

From Wikipedia:

Duration of immunity
The long-term duration of protection from varicella vaccine is unknown, but there are now persons vaccinated twenty years ago with no evidence of waning immunity, while others have become vulnerable in as few as six years...
according to the World Health Organization: "After observation of study populations for periods of up to 20 years in Japan and 10 years in the United States, more than 90% of immunocompetent persons who were vaccinated as children were still protected from varicella."

Measles, Mumps, and Rubella - from Immunization Action Coalition Ask The Experts (www.immunize.org):

Do any adults need "booster" doses of MMR vaccine to prevent measles?
No. Adults with evidence of immunity do not need any further vaccines. No "booster" doses of MMR vaccine are recommended for either adults or children. They are considered to have life-long immunity once they have received the recommended number of MMR vaccine doses or have other evidence of immunity.

Diphtheria, tetanus, and acellular pertussis - From the Mayo Clinic:

Children 10 years of age and older, and adults, may need an additional immunization called a booster against diphtheria, tetanus, and pertussis. Adults and teenagers should receive Tdap instead of the tetanus-diphtheria (Td) injection if it has been 10 years or more since their last tetanus-diphtheria vaccine.

-PJ