Seriously the only thing really missing from Evernote.
I realize that Evernote isn't designed as a "bullet-style" notetaking app, but for taking quality notes, and using your notetaking as a thinking enhancement, you really can't live without proper outline style notetaking, which includes collapsible lists.
Hugely missing feature currently! I ditched Evernote because of (and came back IN SPITE OF) the lack of this feature. It's hugely important to me