I ended up scraping enough together to purchase two 502 one-handed axes for my DK, and was pleasantly surprised to find out that I could transmog them into swords. I don't know when that change went in, but it's awesome. Got my equipped item level up over 490 so maybe I can find my way into a low-key raiding group. Not likely, since I don't tank, but maybe I can pick up a run here or there.
I'm kind of apprehensive about leveling my Mage, Shaman, and Warlock up to 90, because then it gives me options to raid on. I ran into this in Cata where I ended up raiding on Mage, and then watched as we went through bad melee DPS after bad melee DPS, while I was never able to get a chance on my DK because ranged DPS were harder to find, and I was actually decent. We did an alt run once, and I absolutely crushed it on my DK, but I still never got a shot to bring it out regularly, and unfortunately it's the only class I don't get bored with for whatever reason. Oh, well. I was hoping maybe I could find my way into a 25-man group since theoretically there'd be more room for a melee DPS.
Maybe I'll start on some PvP. I haven't run a single battleground since coming back, and have no PvP gear at all. I don't know if I really feel like going through that initial grind to gear up yet again.