Well, I do not wash all projects right away. Blocking and me are not friends either. But that is my personal problem, I guess. At most I lay things flat and put a moist towel on top.
A lot of knitting suffers with every wash. I do not want to use up too many right away.
But you are right: normally people block their things. And a lot of them do it by washing it. Well, maybe I am a 34 year old dinosaur :D
what would the grease of my hands do to my knitting, I wonder, though?