Search and command palette
In a project with hundreds of tickets you don't want to scroll. The command palette finds any ticket by title or number and jumps straight to it, whatever view you are in. It also opens the project settings and the filter panel.
Filters
Filters hide what you don't need right now: just one Epic, just the current Iteration, just tickets with a certain tag. They work across views; you don't have to set them again per view, and you can use them to build your own views.