I managed to hit level 60 on my warlock on November 30th, about a week after lunch. My playing time was a bit limited after that because of some real life commitments, including the wedding of my oldest son!
Let me start this by saying that I'm a casual player, in case that wasn't clear for someone that has 42 max level alts. I've never done any high level raiding, and in fact, the last time I participated in a normal or better raid with an organized raid group was probably early Warlords of Draenor. I do however run LFR a few times when it comes out just to see the fights and the instance.
So now I'm onto endgame with my warlock, and I'm finding it a bit confusing. As usual, running normals seems to be the easiest way to gear for heroics, which will in turn be the easiest way to gear for LFR. The last two expansions, gear-related world quests were also a meaningful way to get this done, but that doesn't appear to be the case any longer.
Emissaries are apparently now callings, and that all seems to work fairly well. The part that is now a bit confusing for me is the Maw and Torghast and how those fit into things for me as a casual player. Torghast seems to mostly be directed at helping you accumulate the materials that you will need to craft legendaries, which would be nice to haves, but I'm not sure are wildly necessary for someone just looking to run LFR. Which is good, because so far, Torghast seems like a giant pain in the butt. I know the various dailies and things in the Maw for good old Venari are designed to reward you with things that will make running Torghast easier, but if I'm not that in to Torghast, I'm also not sure how important that is. I'll continue to work through both of those though and see how that works out.
For me, it may be something that waits until all my crafter characters are to the point that they can create the base legendary items. That may be a while.
So far I'm enjoying the endgame play. I'm definitely missing the flight whistle, but the dungeons are interesting so far and I'm enjoying the process of improving my covenant. There also appear to be lots of mounts that can be collected to go and chase down eventually (I did get the frog one, and I see to have something working on hatching in my bags, but not sure if it's a mount or a pet).
So there is definitely plenty to do to keep you occupied. Raid finder week one releases a week from now, and I'm still not geared enough for heroics, so there's definitely some work to do.