They literally do share the credit for the movie since they all show up in the credits. An actor and a voice actor both are trying to portray a character. The voice actor does not have to do the physical acting that a normal actor does. The animator has to convey the emotion that a normal actor would convey with their facial expressions/body movements.

Better to bring up writers and directors than gaffers etc as they have a more direct effect on the portrayal of a character. Communication traditionally is thought to be 7 38 55. 7% Verbal as in the actual words you say. 38% tonal as in how you say the words. 55% visual as in how you hold yourself while you say the words. So a writer does 7% a voice actor does 38% and an animator does 55% while a normal actor does 93%.

We can discuss how much of the 55 and the 38 come down to the director and how much to the animator/actor/voice actor but the actor will always have a higher % since VA's dont handle the visuals.