Unless you were at the bubble for the seats, I'd say it was close to a no-brainer to shove your 12BB with 33 when it was folded around to you in LP. Of course, when you get called, it'll be pretty wide, so you'll be slightly ahead on a flip or well behind to a higher pair. But when your stack is getting low, you can't wait long. Quite often, this means sticking it in and hoping it is a flip.
Too bad about not winning a seat. It seems like you may have learned a valuable lesson for the future though. The first time I played in the final satellite level for seats to a tournament package above $5k (coincidentally, it was also the Irish Open), I couldn't help but wonder if I'd be completely outclassed. Now, I know - as I assume you do - that even though the fields at this level are tougher than you're used to, you're not in completely over your head.