1. Well, "a lot" may be an overstatement, but, yes, the current show has a major "projection" element that Wishes did not.
2. There have been reports of guests seeing the new show from outside MK.
(With no castle view.) The fireworks are really good, in themselves.
3. That's a question only you can answer.
I think that the cruises, while nice, are far overpriced.
Even more so with the new castle projections, which can't be seen from the boat.
I'd just head to TTC or one of the many other "no-charge" outside the MK viewing areas.