Sure. But while you were dead, was it 'you' benefiting from them, or just the object you used to inhabit?
While you were Magic Jarred, the Bull's Strength spell was still operating... but was it operating on 'you', or just on the body it was cast on? When you return, you 'keep the spell effect', but that doesn't mean you had it the whole time. The spell never stopped operating, but was it always 'you' it was operating on?
Similarly, when you die, the spell keeps operating on your corpse... does that mean it's operating on 'you'? And while your body is dead, are 'you' within 5 feet of the familiar standing next to it?
Yup. Is a dead creature a creature? (Not necessarily a redundant question. Compare: Is a natural armor bonus an armor bonus? Is an incorporeal touch attack a touch attack? Is a monstrous humanoid a humanoid?) After all, a corpse is an object, and an object is 'not a creature'. So if 'you' are a creature, can you be a dead creature if a dead creature is not a creature?
-Hyp.