Glad you got in! As a 4-some we have done our share of walk ups too. Even places like the Sci Fi Dine In, that traditionally never have ADRs, we wait 20-30 minutes and we get in. We also are earlier than most people when we sit for dinner, usually between 4 and 5pm. But I know from experience that when I couldn't get an ADR before arriving at WDW, we go try it anyway as walk-up.