Guess I'll chime in.
Loved: Like everyone else the wealth of options, but I also really loved that every class sorta did it's own thing, barbarian's raged and had appropriately themed rage powers, paladin's had mercies, fighter's weapon and armor training, the summoner's eidolon and it's evolutions. All of these things worked a little different from one another. Something about making it all into feats (not all of it) takes away all of the character, the charm.
Wanted: I actually prefer 4th level spell full BAB classes like the paladin, ranger & bloodrager, instead of the medium BAB 6th level spell casters. I would have liked to see more of those classes. Also a marshal style class would have been nice. Finally some actual epic level rules and support.
Hated: Pathfinder unchained. Didn't like that particular book as a whole, and since it heralded in pathfinder 2e. I'm just not a fan. Mythic rules, not a fan either would have preferred epic rules instead.
Will miss: The first party support, but as long as third party material keeps coming out, I'll be just fine. Personally I think pathfinder 1e still has about another decade of material in it, no need to move to a new edition.