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So, panel lining went well. It even made me like the Granthan head somehow, and I usually don't care for it. I used a fine Prismacolor marker. It's really easy if you wanna do it at home, it doesn't seem to rub off at all (the ink is contained deep within the lines after all), and you can easily clean up any mistakes by lighting rubbing a q-tip or kleenex over the surface.
This Armorvor took a little while because it has a HUGE amount of panel lines, but I imagine something like a Glyan or Traveler would go faster. If you're doing a whole squad, maybe look into using the ink wash technique and then wiping away the excess, that's much speedier.
tl;dr: you can have panel lines back! If you're willing to do a little legwork for em, that is.