You are not alone.  Our neighbors came from California with their aged speedboat they called Yellow Bird.  For years John wanted to upgrade to a Boston Whaler, the type he grew up with.  Their young sons both resisted the change because of their fantastic memories - Yellow Bird was part of the family!  John finally got his dream boat and Yellow Bird sat next to their shed for a year while they made new memories on Plane to Sea.  (John is a pilot.)   Finally they decided it was time to donate it to charity for another family enjoy.
Killevippen, thanks for sharing your memories and sadness over moving on to a new boat.  Rattlesnake Guy is right - you should post more often!