I like optics ... a lot.
When I started using optics seriously for all of my hunting, my success rate when up astronomically. I now take a spotting scope and binoculars with me EVERY time I hunt. I will spend hours at a time glassing upwards of 5 to 10 miles away. Too far for a shot for sure, but that is where the "stalk" part of spot and stalk comes in. If you are getting headaches, there is a problem with your optic ... either the diopter setting is off, or the bins are out of collimation. Even if I was stand hunting with a maximum of 100 yards viewing distance (God help me) I would want at least binoculars to pick apart the cover at the edge of the viewing distance looking for an ear, eye, antler, etc.
If your camera is working for you ... good on ya, but as general advice for western hunters, I would say binoculars should be the FIRST equipment purchase after weapon.
Poke around the forum and check it out, Joe!