Familiars can be very useful. At the most basic and without exposing them to risk, they have all your ranks in skills. Use them to aid another whenever you're doing anything. Scouting. Imbue with spell ability. Give them magic items. A bird dropping a bead from a necklace of fireballs is nasty. Familiars are very useful out-of-combat.
Wild empathy works like diplomacy, but lags behind it because it's class level instead of skill ranks. If you try to do it in a hurry (which has a penalty), unless you are a high level straight class with a high charisma (not otherwise a primary class ability), you'll have little chance to affect hostile animals. And really, how often do you meet animals that are friendly that you need to upgrade to helpful?
Cheers,
=Blue(23)