I did a math-heavy degree, so most of my lecture summaries were all written in LaTeX due to the nature of the content (lots and lots of equations; I published most of my lecture summaries on my homepage). For a few other lectures I used Open Office / Word quite regularly (adding and placing images, and working with tables -- e.g. to picture an array -- was easier for me to accomplish with such a WYSIWYG editor).
Also, a cool thing about LaTeX is that your document source is written in plain text, so you can use git to version your source files.
Funny side note: I was using LaTeX so much during my studies that I wrote a Greasemonkey script to actually extract the LaTeX source behind equations shown on Wikipedia [0]; the equation's LaTeX source is stored in the <img> tag's alt attribute.
Also, a cool thing about LaTeX is that your document source is written in plain text, so you can use git to version your source files.
Funny side note: I was using LaTeX so much during my studies that I wrote a Greasemonkey script to actually extract the LaTeX source behind equations shown on Wikipedia [0]; the equation's LaTeX source is stored in the <img> tag's alt attribute.
[0] https://github.com/giu/wikipedia-tex-source-extractor