In voltage induced in an AC circuit, the C-EMF is moving 90degrees out of phase with the applied current.
Voltage leads current.

Here's where I've hit a brick wall. The analogy I learned a long time ago is- voltage is like the water pressure in a pipe, and current is the speed of the flow.

How can pressure (voltage) lead speed (current)? Speed and pressure are both acting on the same electrons. To me, the "charge" can only be in one place at a time. If the inductive reactance creates a new row of balls that are out of phase then okay, but I still can figure out how you can separate Voltage and Intensity.