"just wondering if any of you use a bike computer or watch which do not more than breadcrumb navigation. How often do you get lost?
Or does it work ok?"
My favorite on-bike navigation interface is still the Garming 200. As long as the little black triangle stays on the little black line I’m ok. The screen has zero glare and good contrast & the backlight works all night long.
Even though I use the Garmin 520 now because the 200 doesn’t integrate external wireless sensors I still miss the Garmin 200 completion bar and the way the Garmin 200 would zoom out forever if I decided to explore off course…the off course route shows up as a dotted line and the 200 zooms out to show where the solid ‘on course’ and the dotted ‘off course’ lines intersect. Always easy to pick your own route back to the course.
On the other hand! 
Bryton and Giant Neostrack breadcrumb navigation are almost unusable. It’s better than nothing but you often have to try at least two different ways for a few miles at an intersection before it’s obvious on the screen which was is the correct one. Jankiest nav interface ever.