I think drama is worth the effort, because you learn things you wouldn't learn elsewhere.
There's a lot to be said for being put into a group not of your choice, being given a random theme, and having to come up with a show to perform in front of your peers on the spot. Drama teaches you to do that, and think how well that corresponds to the work place. Not that I think you'll be asked to show what would happen if a super hero invaded a shopping centre at work, but being able to come up with something on the spot is a powerful tool, as are the group work skills that you'll inevitably get.
Also, the major work, though you will hate it at the time, is really worth doing. Being able to have something physical to show for a year of hard work - it's a cool thing. It makes you feel really good when you finally get it in. And the spaced out nature of the assessment can be really helpful to some people.
That said, if you like Legal better, do that. Do what's fun.