The "one window to rule them all" approach revit has had with the project browser has got to go. there needs to be a much more intuitive, faster way to quickly move between sheets, families, views, schedules, etc, that doesn't involve scrolling up and down an interminably long list all house in one window. the collapsing hierarchical approach is not sufficient.
separate the windows for views, sheets, families, and schedules/legends. offer a quicker, more intuitive way to navigate each that isn't a simple scrollbar window. offer bookmarks for quick access between views or windows. create the ability to quickly cycle through bookmarked views so i can switch quickly back and forth between two or three views without closing every single other view i have open. add a thumbnail preview browser for sheets so i can quickly navigate or tell if something egregious is wrong with a sheet without having to manually open it. give me the option to create a custom project browser window that only has the elements i want at that moment, and which i can customize on the fly. give me the option to better customize and tweak my workflow (quickly and effortlessly) and users can adjust as necessary. right now, its a slog. by far the weakest point of revit is its UX/UI. it impedes workflow rather than helps it along. Improve this and you will save companies millions of dollars in saved time.