I’ve left live shows having a different appreciation for a band, so I can get that. I didn’t fully ‘get’ Tool until I saw them live; as well produced as their albums are, the dynamics at a live show are what really make that band and then the whole visual aspect, it’s a trip.
I’d have to say the same thing for Vai; leading up to the first time I saw him I listened to Passion And Warfare a bunch, it was my first time experiencing his music. I wasn’t a fan at all, but a few weeks later when I saw him my jaw was on the floor.
Definitely not saying you’d have the same experience with Mayer, but I can see how the “Go see it live” aspect has some legitimacy to it. I’m sure I’d have a good time at one of his shows if I got really stoned.