For me, I prefer to keep my screen brightness at 50% or so. In that case a glossy screen is just a distracting mass of reflections, where a matte display is pleasantly usable. Color accuracy isn't an issue for anything I deal with, so the more comfortable appearance of the matte display is a clear winner.

For my digital-artist friends, they do prefer the over-bright glossy displays since it's actually a critical need for their process.