I didn't even know you could see the fireworks from Ohana until our dinner. We had what I believe was an 8:00 dinner reservation, we were buzzed for our seats about 8:15 and they walked us over to our table, which was right against the glass with a dead center view of the castle, I was amazed but I wasn't thinking about fireworks at the time. So 9:00 comes and we are eating our dinner when the lights dim and the Wishes music starts playing, I couldn't believe our view!
Anyways I think we were lucky in that we were a party of two, it seemed like the room was full of groups of 4 or more and the table at the window only sat 2.