I don't have any disabilities (besides my horrible personality) but I find that Accessibility often has incredibly useful features. Just off the top of my head, I use:
- flash screen for alerts (which I use instead of an alert noise because it's less annoying)
- color filters on iPhone to make the screen super red if I'm using it in bed
- drag lock for the Mac trackpad -- which makes it so you can double-tap on something with the cursor and then move it around without holding the trackpad down
... and probably some others I'm forgetting about.