It is true that playing the same scales over and over again can get tedious but there are exceptions. There are two ways to practice. One is where you pick up your guitar and just play along with a song that entices you to use your established skills... ie, alternate picking, sweeps, arpegggios etc. Your not trying to play the song exactly or the solo. Merely hanging with it, doing your own version within the context of the key and using it as a background. But, there is a time when you have to sit down, turn off the music and concentrate on a very specific technique that you are trying to perfect like alternates or sweeps, string skipping etc. This will require strict discipline and hours of work. It is a necessary evil required to advance your skill.