This may not quite fit, but I like to double up on adjectives. He isn't the witty writer, he's the witty, clever writer. It isn't an exciting moment, it's an exciting, delightful moment. I just noticed in the Hub I'm drafting right now that I've done this three times in one sentence!
That is very sound advice. A good way to remember it is to think of Stephen King and imagine some gruesome Kingian fate will befall us if we overuse "ly" words. Be afraid. Be very afraid. Oops. Just be afraid.
My over-used word is "however," which I let myself freely use in forums. I allow myself one "however" in a fictional story or article, but sometimes find another that "sneaked in while I wasn't paying attention" when I proofread it. Then I have to brutally cut it out, even though I love that word! : )
All writers have some of these favorite "padding" words, even best-selling authors. It's fun when reading one of their books to watch for them!