Sure, when throwing some slides together last minute the first thing that comes to mind is "LaTeX".
Maybe you might want to spend some time with LaTeX then. Honestly, it's one of the most useful things I learned in school.
I second that, it's extremely powerful, but not the tool I would reach for a quick last-minute presentation, as well.
I'm with ralmeida here; do you actually make super fast slides with LaTeX? That has definitely not been my experience.
Yeah after 1-2 presentations I built a template and just drop stuff into each slide I have defined. Then if I need more slides I copy the framework bit for a single slide. Super easy.