Only famous drummer I met, and got to know a little bit, was Jeff Plate from Trans-Siberian Orchestra(East).
Back then, he was the drummer in the band Wicked Witch (in the late 80's-90, they were good- but never got a record deal), and they rehearsed in the next room over.
After Wicked Witch, he later went on to be the drummer for Savatage.
Good Guy- very down to earth.
Dave Dicenso was also around the scene back then(he's an associate professor at Berklee in Boston now - Jeff took lessons from him back then, and has said he learned more from Dave than anyone), and he's played for numerous artists over the years(Duran Duran,Farrenheit,Steve Morse, etc...)....never got to know him at all, just a quick hello.
Here's a clip of that guy Dave Dicenso I mentioned above....he's a BEAST.
http://www.youtube.com/watch?v=s_81IomgGEY&feature=youtu.be&t=3m