As bland and copy pasted alot of the areas where in 1.0, I do miss the large open landscape feel they had, especialy 1.0 Coerthas.
Now everything feels so very cramped, not only with players everywhere, but it feels you can't walk more then a few steps without running into bunch of NPCs or a town/questhub.
I miss the sense of scale for the world, and I actualy wish they had some "filler areas" taken straight from 1.0 to go with the remade zones, like for example having a east/west/south part of coerhas which retained the old look.

Other then that I can't think of too much I miss from 1.0, I always found the armory system a bit dumb and the animation lock combat(while it look aestheticly pleasing) felt realy clunky and slow most times, 1.0 crafting was just a terrible chore and I much approve of the new crafting system we have in 2.0.
I do miss items such as AF/relics having additional effects that would enhance certain abilites, I also miss some of the open world dungeons (nanama mines etc) and I miss the higher level mobs in certain areas that added some sense of danger to the world.