IF you use Helper Lines you can follow anything along a line A (x,y,z) B (x,y,z) with space gap (or not) with any snap , existing or not ! ;)

Click without release...release
Before the first click of a function, after the first click of a function before the last click of a function
Disapear after the last click of a function
One of the true gem of MOI! ;)
(and there is more when you click the little white label 1 second after the release click not shown on the video)