I use rules in Outlook 2010 (and did in Outlook 2003 as well) and when a message is moved to a folder with a rule, I don't get a notification at all. I have notifications on, and only get them for things that end up actually in my inbox. I have rules that filter probably over 75% of my mail to other folders so it really keeps the notifications down.
I'm with Doug on the use of rules in Outlook. I have been using them for at least 10 years, back to Outlook 97 days. No pop-up notification on the moved items is great. I check the PTC User mailbox a couple of times a day between other tasks. As to the forums on the PTC/User website, I find them almost useless and very hard to follow a thread. About the only time I use them is to start a new thread, which is very rare.
Each person has to manage these extra communication messages as they see fit and how they best fit into their own environment.