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Hello,

dither decreases the SNR slightly, that's correct. 

Without dither, quantization noise will easily turn systematic, and the ear is very sensitive
to the "pattern". For example, for a sine wave test signal, the quantization error
will concentrate mostly in a small number of spectral lines.

Now we add dithering, and the quantization noise turns more into random white noise.

If you would like to hear the difference, record a quiet note that fades away into the noise
floor (piano or guitar) with and without dither.

-Markus

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