Nikon’s AF-S DX VR Zoom-NIKKOR18-200mm f/3.5-5.6G IF-ED is about the only lens I use anymore. There’s a good reason. If I’m walking through the market in Chichicastenango or Almolonga with a standard zoom, maybe an 18-70mm, and I need to switch lenses for a super close-up, I’ve probably already missed the shot.
The photographs I shoot are fleeting. A versatile lens gives me the ability to instantly decide if I want a close-up portrait with a narrow depth of field, or a wide shot showing activities in the background. Within a second, I can adjust the focal length and be shooting. If I want various focal lengths of the same scene, it's done in a snap.
If I knew in advance that I was only looking to shoot portraits, then it’s fine to use a long, fast lens. However, I have to give up anything that I see that doesn’t fit the capability of the lens.
By the way, the VR (vibration reduction) really does make the versatility of the lens shine through. There are other similar lenses out there. If it fits your shooting style, it might be worth a look.
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Disclaimer: I am not sponsored by Nikon.