+1 on this request! For my power information user friends, this is the single biggest feature issue with Evernote as a primary workspace for people who manage information. Workflowy's model just works better for many areas... I like Evernote's outlining functionality, but adding collapse/expand would be a huge improvement for me. I'm a deeply committed Evernote user (paying, have the Fuji scanner, about 4k notes, I develop using the API, etc.) and yet I end up using Workflowy for many areas of research!