Blizzard has revealed some of the changes it's making to Diablo 4 following the recent beta playtests, and from what I can see, it's addressing the biggest concerns I believe people had.
One of those was boredom with dungeons, particularly in having to traipse back and forth across them. "One of the most common pieces of feedback we received is that players felt they were doing a lot of backtracking within certain dungeons," the company said in a blog post. "We have optimised multiple dungeons across all zones to minimise the need for backtracking."
In Fractured Peaks alone - the zone in the demo - nine dungeons have had their layouts changed. And wherever a dungeon has an objective, especially one you have to carry around, there are now movement speed buffs as well as other enhancements to keep the pace up.