There's "everything"... and "EVERYTHING".
If you include all the MAJOR attractions, PLUS some I only occasionally do...
Tom Sawyer's Island, Swiss Family Treehouse, Tomorrowland Speedway, the NON-dark rides of Fantasyland, Toontown Fair (all of the rides & "houses") the Character Meet 'n Greets...
PLUS all the SHOPS, Restaurants, musical and entertainment "shows" (Dapper Dans, Cinderellabration, Sword in the Stone, etc.), the two Parades and Wishes... There is a LOT to experience.
Can you do MUCH of MK in two days?
Sure, and even do the attractions you really enjoy, several times.
The BEST TIP is to arrive EARLY (at least 20-40 minutes before the opening time, EMH or not).
You will be earliest into the park, and can do more in the first hour (or 2 or 3) than at any other part of the day.