Most games do not give you anything back for looking for the morphing stuff other than a Status at the end game for having found them. Big deal, eh? ha ha However, in some games, finding the extraneous objects can open a new series of puzzle games at the end of the game. I recently played a New York Mysteries game, and if you found all the slides (like old slide-projector slides) in the game ~ and this was ridiculously easy because they were in your face in most scenes ~ the game provided a really fun set of a couple dozen prism puzzles at the end. I enjoyed playing those almost as much as I enjoyed the game. I did one each day, as a little added perk, long after I was done with the game itself.
If the morphs and extra objects are merely distraction, however, I completely agree: They don't add to the game, often are totally unrelated to the game context itself, and it breaks the story line for me to search for them, so I don't bother.