I still don't like the advantage/disadvantage mechanic. That feeling hasn't changed since the initial playtests and one of the reasons why I'm still not a fan of the edition. There are other reasons as well, but that one was the main reason I disengaged from the playtests. The feeling of advancing sideways also doesn't interest me much, but it wasn't an issue I had from the beginning, only from playing the game after its release. There are some nice bits though, so I like to keep up with the edition.
Interesting. I think Advantage/Disadvantage is one of the best things about the edition, especially from a DM's point of view. It makes for a great tool in helping mechanically describe situations without screwing up the math with too many adjustments to the die roll. Plus, it maintains the inherent "swingyness" of the d20, of which I am a huge fan.