You don't need a CS degree to get hired - 12 years of experience is more than enough. Most companies will hire people without CS degrees if they have the experience and can prove it. Just ignore what the job description says and apply anyways.
don't get a degree for the promise of a job, get it because you want to actually learn
In response to one of the responses (that seems to have been deleted) that's a really good point about doing it out of interest.
I think I am interested in the fundamentals of this field, at least enough that I've been reading some of the books and papers in my spare time. If it was just a matter of interest and curiosity, I guess I'd just keep up the reading, which I can do for free anyway.
But I would only invest in a degree if I thought it would boost my earning potential in the Valley. Otherwise it seems better to just keep working full-time, maybe do some short courses here and there.