Thanks for qualifying your lack of sarcasm
and I would say your second representation of what lawyers "do" is probably more descriptive than your first... but perhaps that's just my interpretation. To an extent, all service-oriented professionals serve (or represent) a client. I do that in my current occupation, but I am not an attorney.
If I was forced to define what lawyers "do" I would probably end on the classic answer of "it depends". On what? The discipline of law you plan to practice. And ideally (depending on time, which I am somehow always short on...) include an example or two. Just like not all engineers use CAD and create schematics -- some advise design teams on what is feasible from an engineering standpoint for manufacture or service delivery and they may never directly engineer at all. Our general counsel does that. He advises us what we can and can't do, and rarely creates anything on our behalf (such as a service agreement) -- he mostly just documents his recommendations and their legal substantiations in order to make his recommendations defensible. Meanwhile, friends of mine who are attorneys spend their time buried in paperwork, research or else living from courtroom to courtroom. So, in sum, it depends.
But yes, you are correct -- I did originate the concept that perhaps you were being sarcastic. Much like I hope that a dangerously reckless driver is drunk in hopes that his/her wanton disregard for human life is not 24/7 status quo but instead the product of alcohol and an isolated event (overall reduction in risk exposure). Often I wish people *were* sarcastic, because it would offer an excuse for their otherwise poor reasoning and restore some fraction of my faith in humanity (yes, some sarcasm there...).
Your answer did not convey (in my opinion) an understanding of the intent behind asking the question to begin with. I don't want to speak for IrrX, but it would appear to me that s/he asked the question to hopefully guard against the increasingly myopic tendencies of many law school students and hopefuls. And to instead elicit some forethought into the post-law-school workload (ask yourself -- What would I be doing everyday? Would I like that? Would I like it enough to want to spend 80+ hours a week doing it? Is it worth sacrificing my hobbies or even family time? What would my long-term career path be? How would a law degree catalyze that or not?) All of those questions are questions that hopefully you've already asked yourself.
It's unfortunate, but many people today have an entitlement mentality. They think A-->Z (where "A" is go to law school and "Z" is get rich). And forget to include the hard work and sacrifice it takes to make it through the necessary steps of B through Y (where "B" is go insanely into debt, "C" is work like I'm insanely in debt [oh wait!] ... etc ... intro to formal logic, right?).
Finally, please don't misconstrue my generalizations about the naivete of *many* (e.g. "not all") students as an assertion that they necessarily apply to you. Simply those who feel a sense of personal responsibility to help guide others to help them make good decisions often try to help them think of the less favorable aspects of a decision, in order to better help them weigh the pros and cons.
In the end, it's all your decision. Regardless of your choice, I wish you the best of hard work (there is no luck!), commitment and sacrifice. And above all, the courage to make the difficult choices to succeed in whatever way you define it. (And there is not a hint of sarcasm in that!