Infinite windows of text via Quick Ref windows. Three virtual binders via Copyholders and group views. Bookmarks enhancements, particularly a fourth virtual binder via Quick Ref windows and the bookmarks sidebar. The Corkboard’s new Stacked mode.
Those are the big ones for me. They’ve completely changed how I work.
Minor ones: I happen to prefer the new interface and Themes, but that’s completely subjective. I also prefer the new compiler, but the old one was fine too–I have simple needs in that department. Revision mode can be handy.
Best,
Jim