In no particular order, my top three:
Indiana Jones Adventure
California Screamin' (I can never get over what a spectacular rollercoaster it is. Blows all of the other coasters at DL out of the water!)
Tower of Terror
For non thrill rides, I particularly love Pirates of the Caribbean! But it always changes. When I'm on any of the three rides above, I'm always thinking, "No, THIS one is definitely my all time favorite!"