This was not at O'hana's, but at California Grill. We did not have a window table, but we could see the fireworks just fine from our table. However, our daughters wanted a closer view. They went up to the windows to look and a lovely couple with a window table asked the girls to join them at their table during the show. There were others standing by windows and some people went out on the observation deck (this was before they closed it to the public so it was rather crowded)
What I wanted to say in all this rambling is people don't generally mind.