Welcome Mark.
Zoom B3 owner here. I am slightly overwhelmed (as a hobby bassist) by the seemingly infinite combinations that this relatively simple multi effect unit is capable of. I have really only scratched the surface with what it can do. I am encouraged to hear that the brand is used by working musicians as you describe above.
If you ever feel inclined, I'd love to see a post on how you would use it.
Good point regarding affordable, yet playable instruments. Check out the Build Diaries. There is a lot of interesting stuff, from workable bodges to complete builds of boutique standard. Enjoy.