Yes, I think one of the primary reasons for the "Nothing of Interest" cards is to throw players off who like to count cards in rooms, looking for that "juicy" stack of stuff.
Right! One thing that allways bothered me with the game is that all cards hide all the nice looking art on the tiles. I'm about to remedy that with explorer-tokens instead. I put the cards aside in Sleeves. One sleeve per room. And instead of the cards I use small tokens in different colours to represent the cards instead.