Don't talk out of your ass. Cocaine comes with a much, much bigger euphoric rush than even methamphetamine, which has a much bigger rush than amphetamine. If your coke is less fun than some focus enhancement, it's because somebody sold you a gram of baking powder.

Basically all stimulants can be categorized by a level of euphoric rush, and a level of focus they provide. Caffeine sucks at both, methamphetamine rocks at both, cocaine's good for a body rush but isn't very good for focus, and amphetamine comes with relatively little euphoria for a methamphetamine-comparable level of focus.