Decided to do a complete reroll with the level 100 boost - different server, different faction, different class. Actually went back to my old main class, warlock. Affliction is still a blast, the only thing I miss is instant shadow bolts (that probably hasn't been a thing for a couple of expansions now, and I admit it's not particularly afflictiony).
I'm not quite sure what to do about my old characters. I'd love to keep playing my shaman at least, but after playing on a PVE server for a couple of days I already don't feel like going back to PVP.
Been doing a lot of flying for the invasions and farming for professions/gold and I was surprised to notice the new draw distance limit is actually pretty cool. You can see landmarks from really far away now, which creates a nice atmosphere.