Urge succumbed to!Must.. resist.. urge to engage... with misuse of terminology!
Firstly, in what way does the future exist now? infinite possibilities for the future exist now, this is true, but not the future itself, that's kind of the definition of the term "now". And though over the entire course of time, we obviously spend a lot more time dead than alive, at present, we are wholly alive.
Second, wave functions only have practical significance at the nano level or at extremely high energy levels (ie, the speed of light) which beings of such high mass as ourselves will essentially never achieve. Consequently, it is only in extremely contrived situations such as Schrodinger's cat box that macro-level entities can become so strongly affected by an individual particle's waveform (in this case, the cat being both alive and dead)...I just spent an enjoyable half-hour reading the rather excellent wikipedia article on Schrodinger's cat. Fave line: "...since "observation" has been shown by experiment to have nothing to do with consciousness - or at the very least, any traditional definition of consciousness - most conjecture along these lines probably falls under the "interesting but physically irrelevant" category." ha!
General point though (and they talk about this in that article too), is that all the quantum wave function effects are really only interesting at the quantum level, and so don't really play that large a role in our own conscious experience of the world, except in a few very specific situations.
lastly, undisputed, have you read Greg Egan's Permutation City? I think you'd like it, it plays with some similar ideas, the infinite variety of universes possibly in existence and how the mind could exist/play within them...