I would like to concur with this. We should be able to change the font size of most elements in the UI. In particular, we should be able to use smaller icons on the sidebar and choose the font of lists. Additionally, the iOS client has the exact same problem: you can't choose the default font size for reading and/or writing. A much better UI can be found in applications like Day One for example, which provides one of the most amazing writing UI I've seen on iOS. I really do hope this can come to Evernote. It will be a much better app for it.