My mother was big on flu shots when we were kids, but as soon as I was old enough to decide for myself I was done with them. I don't recall ever getting sick, sick but it did make me feel a couple times a little under the weather.
I think, just like you mentioned, the vaccines we received as kids were important and for the most part seemed safe. But now that the recommended number is above 30 by the time kids are 18, that is just scary to me.
No flu shots here you can bank on that.