OK, here we go. Keep in mind I use the Marklin 3 rail ac system but the concepts are the same.
Here is one of my switches - similar to EZ track I am sure - note that you can still operate the hand throw on it:
Now, there is what is underneath the switch. Marklin has allowed the switch solenoid mechanism - the part that does the actual switching - as well as the decoder, which has a digital address, to be placed underneath the switch - so no drilling or mess, and no wiring - everything you see there is the same, and I won't change it when I put it back on the layout. Note that the decoder handles the power side of things, and the solenoid is plugged into the decoder:
Now, here is how a traditional non-digital setup works. The solenoid is retained of course, but now we use a simple switch that gets its power from the AC main on your transformer. I've had this Atlas one for about 20 years and it still works, it's pretty simple as you can see. The wiring is very simple for it, it's mostly self explanatory. So you would throw the lever when you want to switch. Wire up a bunch of them for each switch you have.
Now, as for the way I control my switches - touch screen baby!! All I do to make a switch do it's thing is press the icon on the screen, the Central Station sends the command to the decoder (each has it's own address, just like a loco) and the decoder sends a burst of power to the solenoid to make the switch. This unit will control anything that has a digital address, be it a switch, signal, turntable, crane, or whatever you dream up.