LyX is great. It's been an utter boon to me as I have disgraphia and can't read my own handwriting.

Wrote almost all my notes in undergrad in it. Wrote at least my first paper of my PhD in it, before moving to latex directly for more control.

I still use LyX today if I need to do some mathematical working. Being able to cut and paste math really is a huge enhancement. I can't imagine writing proofs without it