It's mostly correct that Vedas don't talk much about Bhakti or devotion. But some glimpses (of Bhakti) can still be found.
In the Veda, the relationship between the Gods and human beings is not that of a king and his subjects. The seeker regards God Indra as his friend, father or son.
Indra is the friend who gives joy, (mandayat sakham) - RV 1.4.7
Indra, we are seeking your friendship, we desire you alone. - RV
O Indra develop in you the will power just as a father trains his son
- RV 7.32.26
O Indra, coming together let us converse - RV 1.30.6
We as friends, call Indra for our increase - RV 1.30.7
You may think in anyway, being pleased you may grant me , my wishes.
But i do not desire. Only be pleased, O Indra. - RV 8.45.31
We do not regard ourselves as sinners, indigent or ignorant, since we
regard ourselves as friends of the showerer Indra doing our work. -
O Indra, you are superior to father or brother. You are same as my
mother. - RV 8.1.6
Similarly, all the 14 Mantras of Sukta 1.94, stress Agni's friendship and the help of Agni. All the Mantras end with :
O Agni, may we not suffer separation in our friendship
Samsad agne mA rishAma vayam tava - RV 1.94.1
NOte: Here RV denotes Rig Veda.