So I finally reinstalled after years away and jumped into the beta once it opened. Wanted to share what tripped me up and what felt exactly the same as I remembered.
First thing I did was try to reuse my old retail keybinds and add-ons, since the launcher just pulled them in automatically. That backfired fast, lots of red LUA error text on login. Someone in another thread mentioned you're supposed to disable your retail add-ons first before things behave, which fixed most of it for me. What I still haven't figured out is which of my old Classic-style add-ons actually count as compatible with Forever versus which ones are just quietly broken in the background without throwing an error. Anyone know how to tell the difference?
On the nice side, muscle memory came back quicker than I expected. Basic movement, questing flow, talking to NPCs, all of that felt like riding a bike. Even some old bag items I still had sitting around, like a wand I never used, felt like finding an old photo.
What I took away from this first week: the surface changed more than the bones did. The game still feels like the game underneath, but the add-on and settings layer is a minefield if you just assume old stuff carries over cleanly. I'm treating everything add-on related as guilty until proven innocent now.