"Adding names to the blocked list is the worst way to filter mail."
Is not blacklisting the way Junk Mail filter works in Outlook?. You have to click and block every individual ad e-mail message you get. Then they have an automated method to send out the same garbage ad again but with a slightly different code getting around the filter making you click it again. I really don't have time or energy to waste like that. Personally, I would rather delete everything unless the sender clicks at least once to get through the filter. After all, is that not the way the majority of forum sign ups happen? Whitelisting is the way to go and maybe someone will offer a fix for Outlook.
When you add an address to the blocked sender list, only that address is blocked. You can add the domain instead (from Junk Email Options dialog) but true spammers change addresses and domains often - that address you added to the blocked list may never be used again. While you may think "who cares?", keep in mind that the blocked and safe senders lists have a combined maximum size - fill the lists with single use addresses and you won't have room for legit addresses. More information: http://www.slipstick.com/outlook/rules/understanding-the-safe-and-blocked-senders-lists/
If the message is in the junk folder, Outlook figured it out on it's own, using the junk filter. Blocking the address won't make it work better.
If you prefer to make the sender click a link, go for it, and check the spam trap frequently. A lot of people will decide it's not worth the hassle to click the link. (Nothing irritates me more than people emailing for help but not whitelisting my address before sending me the email. I don't click the links on principle and if I'm in a bad mood, I might not reply when you finally find my message in the spam trap.)
The quickest way to deal with spam is using the Del key. The junk filter on Low will get the worst spam, High will get a lot of newsletters and ads too, plus some personal mail. Using the option to send everything to junk if not in the address book means you need to check the junk folder more often and add addresses to the junk filter - I personally don't like to fill my address book with bulk addresses, but more importantly, this method costs me time because i need to check the junk folder more often. The time I spend looking in the junk folder is more than the Del key costs me.