Sometimes I'll just stay behind the truck or bus. There's no point passing them at the light if they'll have to pass me again half a block later.

Still, I can't see how jumping a red light would be safer. I typically take the lane when riding so if the light turns red I'm lined up with the cars. That means I'm often not the first vehicle at the stop line.

The cyclists I do see jump the lights are also the ones that filter between the lanes or along the curb. I really doubt they're doing that for safety but more likely to save time.