I have updated a number of my plugins to utilize SubNotify. Each plugin automatically uses subnotify by default if SubNotify is installed unless stated otherwise. Only messages that make sense are replaced with subnotify. Usually messages you want to know, but don't have to be obtrusive. So usually status bar messages you don't usually see unless you are looking (but ones that need to be there remain), errors, and sometimes casual messages.
Plugins that have always supported SubNotify
- ThemeScheduler (must be manually enabled)
Anyways, if you are already using SubNotify and any of these plugins, you may have noticed. Some of these plugins rarely show messages, so it is very possible you haven't noticed yet. Anyways, that's it.