I am looking forward to this too. I started playing WoW just after TBC was released and had some great fun. I never got past level 33 though as I had real life things to do. Played the game since on all expansions but Legion never grabbed me, I think I am at 102 or 103 currently. there seems too much faffing around with various game modes, phasing etc. It's good that the game is growing and trying different things but WoW, TBC and Wrath are the best things ever to happen to WoW.
Anyway enough of current retail.
I too played on Nost and Elysium once it transferred over. I created (re-created) my first ever character. Droolinggimp Orc Warrior on the Maelstrom server where some of my RL friends played on. Playing on Nost was fun, hard as there where hundreds of players queueing to kill Sarkoth. That sort of ruined it at the start. I letf it a few weeksa nd went back. Plenty of player leveling and no-one camping mobs to tag. All was good.
I think this will be a good call by Blizzard. I am really looking forward to it.