When I came back to playing the bass after an extended break I was determined to learn to play finger style, only because it seemed to look more proper and I thought my groove playing would improve.
I learnt the finger style and started using with my bands. Just didn't sound right to me, no attack, and I found with a little more thought I could play grooves just as well with the pick.
As has been said before, learning finger style means that I don't have to panic if my pick goes AWOL part-way though a track.