It's a small thing, but I've found it frustrating that some dialog boxes show my favorites, such as Google Drive and Downloads, and others will not. To boot, most of those "others" are in C:\Users\<mylogin>, but that directory isn't in the default list.
http://www.howtogeek.com/97824/ has a nice HOWTO to edit your registry to change that dialog box. The one thing I missed was that it doesn't add to the Save As... list, it replaces what's there.
