Depends on how much EE time you have left after Nemo. That will depend on how close in the Nemo line you get, and if Nemo is open right away (it opened 15 minutes in to EE for us, they were testing the subs).
We had time to do Buzz and Space Mountain after Nemo. The lines in Fantasyland, like Peter Pan had already grown to wear it wasn't worth it. But Buzz and Space wasn't too bad at all at that point.
So really it does depend on the time left over. If you aren't up front at the gates and end up getting to Nemo when there is already a 30-45 minute line, you probably won't have time left to do anything during EE afterwards!