If I did anything wrong, or if you have any advice I am glad to learn better and more.
The /* DO STUFF / and / DO OTHER STUFF */ comments bother me. Did you delete that stuff, or is there really nothing there (yet)?
I see no reason that the code that was posted (incorrectly) shouldn't loop thousands to times per second, and reacting instantly when the switch becomes pressed.
If you deleted code after those comments, then that code could be causing loop() to take a long time to iterate, meaning that you need to hold the switch pressed until loop() starts again, and reads the switch state.