In LaTeX, I can use
\\[3mm] for example, to put extra vertical space, if I think it will improve the readability of displayed, aligned equations. And in fact I find I do this quite a bit. But what is the ConTeXt equivalent to this?
ConTeXt does not have an interface for increasing the interline space. You would have to add the space manually. For example:
If you want, you can add an interface for it. I did not test it too thoroughly.
Then you can use: