When the entire toy glows, it doesn't do anything for me. I'm a little older and remember when some glow in the dark kids toys and clocks contained radioactive paint. Even thought they don't anymore (I don't think) the idea of putting glow in the dark stuff near my genitals makes me uncomfortable.
I do like when the buttons are lighted, because we can see what we are doing. We have sex in the dark a lot at night, and in the early morning, and it's nice to be able to see where the buttons are and being able to find them.