Yes metaphors were commonly used by Saints and our Guru's, much like Sufi's. An example is:
Tie two Bird's together, even though they have four wing's they cannot fly
This is not from Bani btw.
Here is a metaphor from Bani:
Page 419
ਕਲਰਿ ਖੇਤੀ ਬੀਜੀਐ ਕਿਉ ਲਾਹਾ ਪਾਵੈ ॥
कलरि खेती बीजीऐ किउ लाहा पावै ॥
Kalar kẖėṯī bījīai kio lāhā pāvai.
Planting the seeds in the rocky soil, how can one reap a profit?
and another mataphor
ਚਲੇ ਚਲਣਹਾਰ ਵਾਟ ਵਟਾਇਆ ॥
चले चलणहार वाट वटाइआ ॥
Cẖalė cẖalaṇhār vāt vatāiā.
The travellers travel from one road to another.
and another:
ਪਥਰ ਕੀ ਬੇੜੀ ਜੇ ਚੜੈ ਭਰ ਨਾਲਿ ਬੁਡਾਵੈ ॥੪॥
पथर की बेड़ी जे चड़ै भर नालि बुडावै ॥४॥
Pathar kī bėṛī jė cẖaṛai bẖar nāl budāvai. ||4||
If someone embarks on a boat of stone, he shall drown with its cargo. ||4||