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Bivyy's have the advantage of being quick to set up and disassemble. Very useful if you are on the move constantly. Downside? It lacks privacy, you have no room to move, and since your face is next to the bivy roof at all times and you will breathe on it constantly, it collects moisture like a motherfucker. You being a larger guy I would recommend a hammock over a bivy.
>Would I be smart to get a tent with a vestibule for pack/boots/cooking/etc?
All modern tents have vestibules. If they don't its likely a shitty tent, or Ultralight.
>Would a bivy give me enough room for anything but my body?
No.