There's nothing comparable to something like progarchives.com and similar in my experience of the '80s and early '90s. You had to combine muso friends, music store recommendations and random selections, magazines, artist and genre scheduling on Rage (better than MTV here) and you still barely scratched the surface.
I was recommending the playing of Neil Schon to a guitar playing friend recently and we both observed that neither of us had even heard of Journey until well after their popularity had faded. That you could miss a massive US stadium rock act like that seems preposterous in this day and age.