I like that the spell details themselves are purely alphabetical. The 2e PHB with divine / arcane split, then grouped by level and finally alphabetized is a bit of a pain. Yes, eventually I memorized what spells where what level, but going back recently and playing a 2e game involved wasting a lot of time trying to find spells, so the 5e organization is an improvement for sure.
That said, I think the spell LISTS should be more like 2e, where they are grouped by class and then a single column per spell level, with each class being a new page / section (similar to the 2e layout). Also, adding a "spells by school" index (in an appendix?) would have been very nice. Oh, and a ritual list.