I don't remember the Swine Flu in 2009 either.
I do remember the 2013 flu season as being bad. The flu vaccine was not matched correctly to the type of flu that was infecting people. The local hospitals had tents for the overflow patients. We had moved my mother to an assisted living facility in the Spring of 2012. When we went to visit her in 2013, instead of hugging and kissing her, I showed her how to do a fist bump. I did not want to give the flu to my 92 year old mother!
I guess we remember those flu seasons in which we are directly impacted.