I do the same. Most importantly, I use a Dropbox capable plaintext editor on my phone so that no matter where and when my hunches or thoughts come from, they get written down. That has gotten even easier with my phones excellent voice dictation capability (I won't mention which one to avoid a stupid platform war distraction).

I like this solution over Evernote because my notes are not trapped in a proprietary solution, but also because you want the simplest UI so that you focus on your thought. There are many great writing apps for your phone, tablet or pc that take all the distractions away for this very reason.