I use it -- no, abuse it -- in chat-based script-like RPing where each line has a character limit and it's real-time which means time taken to type up and convey a proper paragraph scene can be longer. In journal or forum RPs though, I write it out properly.
Same with fics. I think I've used it before in some Slayers fics when I was writing in a style that fit the genre itself -- comedic value -- but that's about it. Of course, I'll use them in connection to other words in a sentence to demonstrate a... hesitation... in speech, trailing off... (as opposed to cutting off abruptly while talking which is--) and the like, but that's about it.
Using nothing but "..." instead of "His answer was only silence." is just lazy.