Wait,wait,wait!!! STOP shooting NEF-only, and start shooting RAW + JPEG Fine, in say, 12 megapixel size JPEGS. The .NEF files will ***always** be full-sized, 24-megapixel, but you can select the Image Area (size) on the JPEGs.
If you want a faster workflow, then set the camera up RAW+JPEG, 12-megapixel, set in-camera sharpening to like a Plus-2 level, and AUTO Tone curve (contrast), and then pick a Nikon Picture Style from the options...Maybe not standard, but maybe...this way you'll have a sharpened straight out of camera .JPG image to look at, and with sharpoening swet to +2 or +3, you can immediately, easily see out of focus shots, and so on, blurry shots, etc..
How tyou use a modern digital camera depends on HOW you want to "use" the camera's pictures...if the camera is set up right, and allowed to do vingnetting rem,oval, auto-chromatic abeeration removal, automatic noise reduction,and so on. I will tell you this: beginning with the Exmore sensor and the Nikon D3x, Nikon's IN-camera JPEG engine, sharpening, and noise removal routines are VERY good...the High ISO NR is very good. very good.
I've shot the D3x in RAW+JPEG and custom-tweaked the JPEG profile to be very close to what I create after Lightroom processing my NEFS. The camera can now do very good work, but you need to allow them to do so! Use Matrix metering! Set AUTO on Dynamic Range Optimizer, and so on. But--there is no need to feel guilty about shooting a partial-JPEG workflow, especially if you want sRGB, SOOC JPEGS to see on a phone, or web browser, or to e-mail, OR to use to do slide-shows to select the best images in a rapid-fire kill-kil-kil-kill-KEEP-kill-kill-kill-KEEP type of culling process. Edit/cull the clunkers ruthlessly and fast.
Do not let forum people tell you "ONLY RAW is the best way to go." Because, no, for some people ishooting only in RAW mode is NOT the best way to shoot!