I play bard and do use songs whenever possible. That probably stems from my enjoyment of bard in 11 though.

However, in FF14 a bard is ranger. The songs are really slightly underwhelming. Also BLM, SCH, and SMN really don't need songs, save for the longest of fights. So whats left? You sing for DRG TP, WHT MP, and sometimes i will pop a song if there are enough BLM/SMN to make the Elemental debuff worthwhile.