If you see the ELP from it's starting point in Paradise Pier, walk really fast over to DL (no stopping for anything) and don't expect a prime location for the fireworks (expect to be on the train station end of Main Street), yes, you can indeed see the fireworks from inside DL. You can even then see Fantasmic if they have a 10:30 show (again, you won't be able to get one of the best spots). To do this, though, you'll have to make like salmon and walk against the crowds leaving the park.