I know that Splash Mountain, The Haunted Mansion, and Big Thunder Mountain Railroad are NOT open for EE.
We went to Magic Kingdom for EE a few weeks ago.
We were near Buzz LightYear and I asked a CM, "Is Thunder Mountain Railroad open now?"
He said, "You mean BIG Thunder Mountain Railroad?"
I said, "No, Little Thunder Mountain Railroad."
We both laughed.
He said it was open and we headed over there.
That area is not open though.
But, I think it should be!
We go to EE parks because we get up very early and figure we may as well get going.
We went on Buzz Lightyear 4 times in a row, my husband LOVES that ride!
At MGM we get a fast pass for Rock'n'Rollercoaster but then we just walk on. Sometimes we walk on twice. Then we go on Tower of Terror a couple of times, then back to RNR.
Seems like we go on those two rides A LOT!
Early Entry works well for us.
Have fun!