It sure is going to be crowded at the resort patios. Of course you can stand up by the walkway that goes along the beach. One doesn't need to stand close to the water in order to see it.
Approximate times for Electrical Water Pageant are:
. . . Poly at 9:00pm
. . . Grand Floridian at 9:20pm
. . . Wilderness Lodge at 9:35pm
. . . Fort Wilderness at 9:45pm
. . . Contemporary at 10:05pm
. . . Magic Kingdom at 10:20 p.m. during extended MK park hours