The truth is, using a needle threader is a time saver because the needle is threaded correctly the first time - every time.
To use a threader, pass the wire or hook through the eye of the needle.
Insert the end of the thread, floss or yarn through the wire or hook.
Pull the threader through the eye of the needle, pulling the thread through with it. Your threaded needle is now ready to use.
If you have difficulty pulling your thread through the eye, your embroidery needle is probably not be the correct size for the thread. Try using a needle with a slightly larger eye.
Even if you are a dedicated lick 'em and stick 'em needle-threading enthusiast, you'll find the using a threader can save time, and can help tame slippery threads during the threading process.