Right now, Delves appear to be where it's at. Although I am still hopeful that Follower Dungeons will get some love in the future. I have a dream to be able to roll through some dungeons with all of my alts. The current AI being used is really nice and well thought out. They will remove curses, apply buffs, and lay out Mage Food. They even give suggestions for short cuts. If you haven't joined any Follower Dungeons recently, I highly recommend it. It's a great way to learn your role (Tank/Healer/DPS) - and Captain Garrick is a pretty awesome tank.
Right now, with my Warband Mentored Leveling at 20% I am getting almost a whole level per dungeon at level 13 while running Dragonflight dungeons. That's not too bad. And you can pretty much do them blindfolded if you want. You just have to keep up.