I find it depends on how many things are in the toolbar, and if the icons are actually icons or monochromatic glyphs. A toolbar that’s populated only with the

I find it depends on how many things are in the toolbar, and if the icons are actually icons or monochromatic glyphs. A toolbar that’s populated only with the most frequently used functions and employs full color, uniquely shaped icons can be visually grokked in an instant, whereas a densely packed toolbar full of glyphs is inscrutable at a glance.