Biceps

Im wondering whether the bicep workout is really worth it... If you have to spend a day or so with sore biceps and arms, then whats the go with trying to do other muscles too? Im contemplating a gym session tomorrow simply because after a bicep workout and a swim session its quite a struggle to not feel pre-sore, so what do I feel tomorrow?
Also, to the contrary of the stereotype of 'big bicep, big strength', bigger biceps doesn't actually make you much stronger, in fact, bicep's are by default a defensive muscle. Back or shoulder muscles would definitely show to be muscles that pack a punch.
If I do go tomorrow, might go a leg or shoulder sess.