I'm on the other end of the spectrum than you guys, I save so much it's actually a detriment to getting stuff done. I'll look at my model, save, *THINK* about what I need to do next, and then save when I'm done with my thought.
Work on an object for hours, without saving at least once, and then program crashes and no backup was made because it hadn't been saved once so was still Default scene....
I saw a couple people complaining about the space bar in max, at first i was like "Huh, it's that bad? I don't even know what it does" so i loaded up max. I pressed space with something selected and straight away I said out loud, "fucking THAT" I always thought that max was locked up and restarted every time. God damn…
I used to chamfer edges then meshsmooth when I made hard surface high poly models. Then spent ages cleaning the mesh when the corners always screwed up. To this day I still compulsively save every few minutes or before doing anything that could even remotely crash or stuff up. To compound this I have incremental save…
Hehe, I had a habit of that as well, which isn't that smart when you have activated Increment Saves. Did that in XSI and suddenly ran out of harddisk space ;)