The distinction you’re making between using scales and using licks is kind of unclear. I can think of two obvious ways to interpret your question:
- Which players know scales and which just memorize licks?
This interpretation implies that a scale is just a set of notes that defines a key.
- Which player play scales in their solos, and which play licks and patterns?
This interpretation implies that a scale is a series of notes played in order.
In other words, ‘knowing’ a scale and ‘playing’ a scale are different things, and it’s not clear which, if either, you mean by ‘utilizing’ a scale.
From the discussion above, it seems that you’re asking question 1. (I say that because of your question about how they stay in key.) I’d say that any famous or even halfway decent shredder knows scales. In order to write licks and patterns you have to know (at least unconsciously) the notes in the key. Warren, George, EVH, and most other players of that style play licks based on the pentatonic minor, blues, aeolian (natural minor), and dorian scales, which are all very similar to each other and easy to mix together even in a single lick. (George has a tendency to throw in extra notes from outside these scales, though he’s said he doesn’t know how those notes relate to the key.) Getting around the fretboard isn’t a problem if you know which notes are in the scale. You don’t have to play scales to move around the fretboard. You just have to know where the notes in the scale are on the fretboard, you don’t have to play them in order.
@Troy has discussed question 2 in one of the videos (somewhere in season 2, I think; not sure which episode). Few players of that era included long scale runs in their playing because 3nps runs are hard without a well-developed string-switching strategy, which wasn’t widely understood until Troy and the CTC team came along. But that doesn’t mean they don’t know the notes.