Productive? Supreme Court Justices do more in a day to develop the field of law that most lawyers in their lifetime. What is productivity? Filling motions at the courthouse? Drafting a contract or two?
The whole judicial system rests on those Supreme Court justices. I think they are very productive.
The purpose of the judicial branch is to interpret existing law, which is ever changing and evolving as a result. No two cases are exactly alike, and although your average lawyer might not set a whole heckuva lot of precedent, it is the law firm's responsibility to research any law, including case law, to even maintain a practical precedent already in place.
Without brilliant attorneys, the Supreme Court would not have much reading to do- and by the way, the Supreme Court tosses out about 95-99% of the cases it gets, without so much as a rudimentary review. MAYBE that is because some of the justices just get lazy or don't care about certain issues, or MAYBE it is because the person who gave them the case briefing (generally 30 pages or longer) was not a lawyer, but felt that they had enough of an understanding of the judicial system to do the briefing themselves..
Lawyers have to do a LOT of work to build a good case. Say they are representing the plaintiff- they have to interview the plaintiff, find hard evidence, dig deeper, and get more evidence for the discovery file, do all this filing and shit without getting paid for filing and retrieving files, make trips for no pay (except gas) keep digging and digging, just towards the case itself- the merits- and then they have to dig around and find case law and other supreme laws, that go for and against their client's case.. They also have to depose people, and make a ton of phone calls to keep people updated, send around memorandum of fact to other people working on the case, to keep them updated, try like hell to get their clients to pay their bills, and in the midst of all this shit they still have to DOCUMENT every single minute that they worked accurately, to avoid malpractice and getting disbarred.
It is an underappreciated profession, to say the least.. Lawyers work damn hard for the money, and deserve some recognition.
VD- I am sorry if all you (most likely) ever got was a shitty Public Defender, but those guys are so overworked and underpaid it is ridiculous. Supreme Court Justices, on the other hand, are most certainly not working 80 hour weeks to try to take care of all those cases that get tossed in the shredder.. And if they SAY they do, they definitely do not have to account for those hours on a time sheet.