I will unabashedly claim that these words are a part of my vocabulary. I'm not particularly proud of this fact any more than am I particularly ashamed of it. It is simply, a fact. What's more, I find these words to be irreplaceable in conveying certain sentiments and attitudes in certain situations and settings. I like to use them. Language evolves, and I'm not sure that this is always a bad thing. It used to be considered horrible slang to use "OK". This is no longer the case, and I think that the same thing will probably happen to some of these phrases.
I don't condemn these words or their newly found uses to be evil or juvenile when employed in the proper setting. There is a times and a place for such words to be used or misused to prove a point, or just because one happens to like the way they sound. A personal favorite for me is the word "so". I used it in many forms, my favorite being as a sentence opener ("So, I watched the Ducks game last week....") or as a complete sentence at the end of a paragraph ("The Roper got taken out with a knee injury when the game went into double over time, which looks bad for the Ducks. So."). I also occasionally do use it in that most hideous of forms, to express a superlative ("That was SO not kosher!").
I also enjoy making up words ("Beautimus" comes to mind) and adding "ness" as a suffix onto the end of words. I.E. "That is awesomness!", "Sweetness!", and "Yumminess!".
Moderate use of words such as "like", "so", "dude", "retarded", and even "sweet" do not bother me in the least. The overuse of these words, like the over use of any words IS annoying. (I myself will admit to overusing the word "retarded". But I prefer to blame it on the alarming amount of things I encounter that are retarded, rather than on my inability to use any other adjectives to describe idiot behaviors.)
Mind you, there is a context for these things. They don't really belong in, say, a presidential speech. But for day to day communication I see no problem in employing these words. I commend those who wish to clear their vocabulary of such words because they feel it's important. That just doesn't happen to be my view of it. Anyway, this is something I have been thinking about for awhile and thought I would share.