It's always easy to spot people who make a living programming solely in Flash. It's kind of an interesting phenomenon -- people will suddenly, and vocally, speak up in support of Flash with outlandish claims.
I haven't programmed Flash in my life, but I can't say I've had Flash crash on me more often than, say, once a few months. Definitely not often enough that I notice it as a major annoyance, on either Mac or Windows.
Now, Flash is annoying for other reasons, but crashing isn't one -- for me.
(offer an anecdote, receive an anecdote.)