The regular wizards use it to, let's say, make a door open when someone says "open" or other minor one-step commands.
The protagonist, a modern human stuck in a magical world, uses it differently. He creates sequences with it. He scripts complex programs.
[Minor Spoiler] As an example, he ends up creating a magical pistol. When the users speak "reload", the pistol (which the character imbued with a few spells using "enchant") casts a detection spell to finds the closest bullets. If bullets are found, the pistol then casts the spell "aports" on it. The bullets are teleported into the chamber of the pistol. He uses the same concept but with transmogrification enchantments to add voice commands such as "sword mode" or "pistol mode" that transform the pistol into a sword and vice-versa.
Is that bad? Like any didactic subtype of the genre, rationalist fiction often struggles to succeed in both of the goals set for it; the only example I've as yet found enjoyable - and extremely so! I strongly recommend it - is Unsong by Scott Alexander, also of Slate Star Codex.
https://parahumans.wordpress.com/ if you want something to read for next month(s).
From an unofficial (and somewhat grammatically atrocious) English translation of the original novel [0]:
> Normally, Eru would have given up at this stage and would have chosen a more practical spell. But he knew how to solve the problem because of his unique skills ― programming concept. He had experience in designing and coding software to handle multiple variables. That's why he skipped the beginner magic phase and jumped straight into the 'modified magic' phase. Reviewing the structure of the physical boost script, Eru compressed the structure to minimise the number of variables, creating subscripts that would automatically extract the status of the body. After compiling it, he just needed to design the user interface to make it easier to control, so as to lessen the burden.
> Complicated projects like the improvement of scripts was not something that could be done easily by anyone. Eru, however, was not aware of this, completing the improvement shortly, and the patch was a big enhancement. But even so, it was still difficult to control magic that strained the mind heavily. But with his extraordinary processing ability, it was not much. No one realised that a historical revolution had occurred, but for Eru, this was just a small step in his journey.
[0] http://webcache.googleusercontent.com/search?q=cache:http://...