There is the Tomorrowland Skyline Lounge, which is seating, and which offers a "view" (disney calls it a "glimpse") of the fireworks, but I wouldn't count that as a great view, it's quite far, and you can't see any projections from that location.
Otherwise, for other events:
The only current reservations that I know of are:
1) For the soundsational parade (only on certain days) at Plaza Inn. I presume this is standing.
2) World of Color (Dining Packages at two different restaurants or the Desert Party) ... Dessert party offers seating, Dining is standing.
3) Fantasmic (3 different restaurants) .. these are usually seating, but on the ground.
4) Frozen show (1 restaurant), this gets you pretty much any seat in the theater you want.