I'm in the same boat as you- ORAS is currently my favorite of all time. :) Alpha Sapphire got me out of my seemingly hopeless burnout from playing Pokémon, and it returned me to the beginnings of my days of playing Pokémon as a child. It got me to really start liking the Gen VI mechanics and visuals, and even expanding upon and perfecting the former (AreaNav and DexNav are among the greatest additions to the series and should be permanent!). They improved on the original story so much especially by implementing references to Kalos and Mega Evolution. The new cinematic cutscenes are brilliant and breathe new beautiful, emotional life into the beloved Hoenn stories (some of them
absolutely took my breath away all the way through!). ORAS was how I gained my love of Latias. <3 And although short, I loved the hell out of the Delta Episode! I don't have much memory of what typical post-games were like for me, but I really enjoyed this one! I love Zinnia and the whole sequence of her telling the ancient story of Rayquaza, Kyogre, and Groudon (not only mixing Ruby/Sapphire's story with Emerald's, but also implementing some stuff about the new Primal formes), summoning the mighty beast, and me capturing it.
The new, deeper developments of characters like Steven, your Rival, and Wally, are amazing, and don't even get me started on the soundtrack. They bring back memories while still instilling a new, different, more modern feel. While some of the songs are
quite faithful to the originals, and some are an
entirely new take, all of the songs are amazing in their own rights, and in many cases, warmly nostalgic for the people who grew up with them. :) It is especially the latter for me, and combined with the modern Pokémon (beautifully emphasized by way of Pokémon from other regions, both newer and older than Gen III, migrating over to Hoenn after you tame the mighty primordial Kyogre/Groudon, I love the way they did that so much :) ), mechanics, and other things we've all come to love? I couldn't ask for a better package. ^^
For me, ORAS has major spiritual significance for me in that it was not only a love letter from my childhood of loving and playing Pokémon, but was also a reawakening for me, to get me to keep my love of the games, and to never let it go. <3