Watch the Using Triads For An Intervallic Sound online guitar lesson by Joe Pinnavaia from Focus On: Fusion

Triads are an essential way of getting around the fretboard and also playing through key changes. Even if you were not playing over changes you can still outline the harmony better with a better understanding and grasp of what triads bring to the table. Also seeing where triads overlap and how they can generate lines that have a heavier harmonic content is exciting and refreshing.