Too much noise is made about lenses that "do it all" at the expense of what you're comfortable with. When I'm traveling in new places with new scenery, I don't want to be adjusting to focal lengths that feel unnatural and new to me. That's a recipe for bad photographs, even if a new lens will technically allow you to do "more." I'm most comfortable with my 23mm and 35mm f/1.4 lenses, so that's what I bring when I travel. Depending on where I'm going I may bring my 55-200mm or my 56mm for the remaining 5% of shots depending on where I'm going, but my top 2 lenses are always what I'm most comfortable shooting with and I only adjust my kit if I feel that it merits bringing a third lens.