If I am understanding your correctly with a document open, go to View on the menu bar and you will see the list of all the Snap To options along with their hot key assignments. I use hot keys (shortcut keys) to turn on and off Snap to Grid, Snap to Objects & Dynamic Guides.
To make things faster I added a Snap to Guidelines button to my property bar for turning on and off when needed.
I keep everything turned off until I need to use the function. As mentioned by keeping turned off, snapping doesn't interfere with my freehand drawing.