If it's already listed somewhere easily accessible, feel free to delete this, but I found the answer myself, since i didn't see it anywhere.
(I did a search on the forum first, and nothing was found.)
Line numbers ARE available in ConTEXT, and can be enabled.
Go to: Options, Environment Options, Editor, and make sure 'Line Number' is checked. It is disabled by default.
TADA!
Now you don't have to cut and paste your code into Notepad++ just to be able to see which line you need to fix!
Life is good.
~V~