Completely agree with CamColt.
Yes, you can see it if you are lucky enough to snag a window seat facing it. But many many tables in the place have no view at all, ours didn't. You, of course, can walk around and view it, but there is a weird step down in the restaurant so in order to view it, we had to bend over LOL. Wishes is about 14 min long, so after about, say, 2 min you'll retreat back to the comfort of your chair and forget it. Which is just what we did. None of the tables around us even bothered.
THey do dim the lights a bit and pipe in the music, but things were still going on around us... food delivery, conversation, etc.
It's not a really great view, certainly not as magical as standing on Main St, since you're pretty far from it.
If you want to shoot for it, make a PS about an hour before Wishes is scheduled that night, and then arrive early and request a window seat to see it. I would think you might have to wait awhile, but I have no clue as we didn't bother... I bet alot of people request it.
Or you could eat there, and then just head to the beach to see it, and be guaranteed a view =)
The food is incredible there, our fave restaurant so far, so Wishes or not, you'll enjoy your exp!!!