its something to do when you are sitting on a position and do not want to watch each tick... or when you are working if you are on hold or waiting for an appt to commence. plus, if you look things up you can learn things.
No, it's not a waste of time. Fun is never a waste of time. Now, go out and ride your bicycle or shoot a few hoops and clear your mind.
How many times have you have to look something up while watching TV ? And sometimes I've had to actually learn what I pretend to know.