There's a saying that the FLGS that got me started on playing AD&D as a regular hobby had. It's probably fairly common, but the saying was that "the best game sessions are when no one ever picks up a die." The idea being that the best sessions were the sessions full of Role Play and non-die related conflict resolution. Maybe the DM just hand waived certain tasks as not needing rolls, or maybe the players just got really inventive and took care of things in a way that it wasn't worth rolling for.
My question for you today though is this: with your personal experience what makes for the best gaming sessions?
My answer would probably be that the best game sessions are when everyone clicks, stays in character, and the plot gets meaningful movement forward. Now, the "plot" in this situation could be a personal plot, the meta-arc the game is running off of, or just some small side ways thing. The point is though that stuff happens and people keep that atmosphere going. It's a rare thing to see, life is fully of distractions afterall, but when it happens you get something truly special.
What about you?