Hi Luke..
The benefits ?, how often do your feet slip on normal pedals, especially in the wet. Perhaps not often, but it wont happen with clipless pedals and proper shoes, you're at one with the bike so's to speak.
Climbing when out of the saddle, again, you're not going to slip or move about on the pedals, you're fixed in the optimum position.
It is a scary thing to get used to, just about everyone falls or nearly does at first, but once you get mentally used to anticipating the need to unclip, it becomes second nature. Ive been clipless for 6 years maybe, fallen once at first, never again though.
I found as a beginner to them, when approaching potential situations where i might have to unclip, i'd just click one foot out, but leave the foot on the pedal...you can still pedal (gently) as you're perhaps approaching a junction or T/Ls. For me it wasnt the unclipping that was the problem, it was not anticipating the need to unclip soon enough, then trying to do it at the last second.
As most say, once youve got them and got used to them, you'll never go back.