You know, it's annoying when there are places you really want to go to but can't snag a reservation, or, in your case, you miss the opening of dining reservations and suddenly they're gone. If you haven't already signed up, try one of the notification services or just keep checking. I used m....d..... to try for Trader Sam's, which I'd been unable to get on my own. After 5 misses (received a notification that there was an availability but I wasn't quick enough to grab it), I finally succeeded last night! Anyway, I hate this new dining reservation "system" which is atrocious.
However, many places will take you as a walk-up, so don't despair yet. Also, there are lots of CS options that are really good these days. And finally, don't rule out DTD restaurants. I love Ralph Brennan's Jazz Kitchen (sit-down for meals, CS for beignets) & Ballast Point. I love Hearthstone Lounge in GCH (which doesn't take reservations). Tangaroa Terrace at DLH is also a favorite.