Crossplay is such a huge addition for me. I started playing Destiny: The Taken King on Xbox One with 3 old high school friends in 2015, but the only one of them who still plays as much as me, and is far better than I am, switched to PC with Destiny 2.
In the last two weeks we've been able to play together several times. I got to beat my first-ever dungeons (Prophecy, and Pit of Heresy twice), I got Xenophage, we worked together on the Shattered Realm last week, and yesterday we beat the 1320 Nightfall.
As for this season, it'll be hard to top the last two in terms of story, but they've really been doing well in that regard lately so I'm assuming there will be more to it than just "we help Savathun, she tricks us, go buy The Witch Queen this spring to see what happens next!" I'm enjoying the Shattered Realm quite a bit, with all the mysteries to find and collect. Astral Alignment is okay, certainly more fun than the last few six-person activities. I've got my loadout modded for all fusion rifles all the time, which is great for my Jotunn/Null Composure/Sleeper options, but I hate that I have to either use a Bow or a Solar subclass (or both, really) for Overload champions. I'm already at level 80 for the season, 1337 max power (1324 base + seasonal boost).