It depends what you mean by legendaries. If you mean the Uber ones (Dialga, Lugia etc.) then no, I don't use them. IIRC, I used to use them when I was younger, but I don't now. I think i used a Lugia on my Pokemon Silver when I went through it for the first time.
However, I do use legendaries like Suicune. Heck, I have one on my Soul SIlver. Not all legendaries are extremely powerful, and to those saying it's like cheating: the high catch rate makes up the training imo, unless you use a Master Ball (I used a Ultra Ball to catch my Suicune, I think. It's a shame you get it so late in the game, and I much preferred its lcoation in Pokemon Crystal.)