Good advice! You've got me beat by a few years, but I've been doing this a long time and I know exactly what you mean. When I play out, I hardly look at lyrics and sometimes I don't even have them available depending on the show.
If you're anything like me, I've forgotten more songs than I know! Sometimes I'm doing an informal gig with songs I haven't played in a long time. Sometimes I'm sharing my screen with someone unfamiliar with how to play the song. Or maybe I need to quick rehearse 50 songs for a fill-in gig. If I've already spent time and made my notations in ChordPro, it just makes everything super simple and fast.
For me, my song sheets have evolved over the years from simple Word docs and pdfs in a binder to migrating to apps.
ChordPro format seems to make the most sense to me because of it's used by the best song apps. It's simple, transposable, and chords are perfectly placed. If I need to create a songbook for a gig for the other musicians I can create one quickly in either pdf or on the computer.
I've got 250+ songs in ST3 with multitracks, and my library is always growing. Sometimes my brain is going to need a couple seconds to scan a piece of tab or a lyric.