When I'm laying out photos to be printed, I normally use Pages to set them to the size and position I want. So it's a major annoyance that once there's a lot of stuff on the page, the picture I'm dragging will snap to the automatic alignment guides all the time -- so I'm forced to use the arrow keys for fine control.

But I've found a new way out. Press Command while dragging the picture, and the automatic alignment guides will be disabled.