Don't remember having flu since about 1973.
Not sure when I started getting the vaccine annually but haven't missed for at least a couple of decades. No flu. Minimal reaction to the injection - none in recent years.
I'm a believer in vaccination, generally. Can help lessen the chance of getting influenza or lessen the severity if flu is contracted.
Herd immunity is a good thing, too. The more people who are vaccinated, less risk for non-vaccinated folks to catch flu.