Check out this game that occurred as recently as yesterday, while I was typing up my previous post.
Notice the smooth flow of the game, with Nezh aiming gradually for the King by building up
the attacking position first, with logical human-like maneuvers (Rook lift, K-side pawn storm) then
followed by a spectacular trap with Rf8-f3!!? which may or may not be the best move, objectively,
but one that poses immediate problems, and then the smashing blow Nxd4 that finished off
poor Phalanx (a fine engine of GM strength, otherwise).
[Edit: this game was played entirely without a book]
Engines may not actually plan, but a combination of high-end search and a really good evaluation can produce what looks a lot like plans, for all intents and purposes. Hide the names of the players and show this game to a real GM, asking him to try to guess who had Black.
What impresses me about Nezh, besides the dazzling sacs, is this ability to build up powerful menacing positions. Without the preexistence of these positions, these sacs could never arrive at all. It reminds of what Spielmann said about Alekhine - (paraphrasing) that he could see the same sacrifices or combinations as well as Alekhine did, but that he was unable to bring about the underlying positions in the first place!