Each day that I go out to do photography, I pick one lens and attach it to a camera. That is the only lens and camera that I carry and use for the day. I travel light and make best use of the camera with the one lens.
Yesterday we visited the Desert Botanical Garden in Phoenix. I brought my D3 with a Tamron 28 - 105mm f/2.8 lens. I captured some pretty good images. My wife brought her D40X with an 18 - 135mm f/3.5 - 5.6 lens. She too captured some excellent images. I observed others that were carrying a large backpacks full of lenses and gadgets. They appeared to be more involved with the toys than the marvelous environment that they were visiting and the hundreds of images just waiting to be visualized.
I just reflected back. Years ago I traveled with a Rolleicord TLR, just the one 80mm f/3.5 lens. There were no lens choices yet I could still capture images that appeared in my minds eye.
Travel light. Become part of the envoronment. Enjoy.