yes it's true, Venice is quite small, but there are so many things to see and, often, there is no need to see anything, you can simply walk randomly and you will find yourself in front of some small magical corner that you had not seen before.
Or some bar where you can drink wine and eat some cicchetto with "Baccalà"

But watch out for the pigeons, they are real bastards, last time one shit on my head!