Heh, I know that itch very well. For me it materialized when I picked up the game in bfa after giving it up "permanently" before mists.
It wasn't the greatest expansion to come back to, but I had a friend to occasionally play with (he was raiding). I wanted to see how mythic+ worked and I loved it, but eventually only playing with pugs ground me down and I dropped it.
I would lie if I said TWW wasn't tempting again...