I also actively use Evernote for organising ideas fo work, home and learning. As noted above I see the tags and saved searches as key to organise ideas. My most cherished feature is the ability to save searches based on key words not tags. Looking at the competitors I also agree we don’t want Evernote to get too complex.
In the future I want Evernote to be smarter and to be able to identify keywords that I type and then show me in a saved search these as a suggestion. (Google does this with photos). I want to be able to review these topics. In a way the tool could act