The best thing you can do is take the smallest effective dose as rarely as required.
PRN (as-needed) use is very common and isn't bad at all. In fact, it's the best way to use Xanax (or any benzo) if possible.
That said, I'm definitely not anti-benzo by any means. It's just that it makes no sense at all to use more of it than you need or use it more often than you need. If a tiny amount like 0.5mg twice a week works for you, that's great and that's what you should take.
One of the major problems you'll read of on the med forum is that many doctors hand out amounts way too small to meet patient needs. You should consider yourself VERY lucky that your needs are so very modest such that 52 mg of Xanax is a year's supply for you.
I'm at the opposite end of the spectrum, having been accurately termed the "Xanax muncher" by some on this board. As far as I know, nobody on SAS has a larger scrip than I do: up to 10 mg a day, so my Xanax comes in a bottle that contains 150 2mg bars. I'd note the factory bottles that pharmacies get this stuff in only contain 100 2mg bars, so it's a lot.
My actual intake this year has probably averaged around 5mg a day, which is down from the 10 I actually used to take ever day.