I don't think I have until a friend mentioned it to me recently when I complained about my writing and using words like "great" all the time!
So now instead of using the same words all the time I always have my thesaurus open on my computer so I can quickly check if I want to use another word -I also bought a hard copy of a thesaurus however find the internet one a lot quicker.
At least with all this modern technology, we should cut down less trees!