I tried using Markers to let me know when I hit a chorus and found them so dinky and hard to see against the DAWs background that they were useless. To get around this, I inserted a midi track, and chose a bright yellow for the track, then using my midi keyboard, I hit a sustained piano chord. On playback, I disabled the output and shrunk the track down. Now I at least can see clearly a bright yellow bar when the chorus comes around.
But, how much easier would it be if Sonar provided a 'Highlight The Track' function with at least a brighter background so you could highlight the areas that need it. Preferably, you could do so across all tracks, and possibly use more than one color, therby highlighting choruses with blue, instrumental breaks with red, etc, etc...